[python] Support for grammars

- Translation rules can now be create programatically
- Grammars = list of translation rules can be used for translation
- Feature expectations on the hypergraph (inside_outside)

15 files changed, 7400 insertions, 3143 deletions

diff --git a/python/cdec/__init__.py b/python/cdec/__init__.py
index 0d7b8782..89c323ba 100644
--- a/python/cdec/__init__.py
+++ b/python/cdec/__init__.py
@@ -1,2 +1 @@
-from _cdec import Decoder, Lattice
-import score
+from _cdec import Decoder, Lattice, TRule, NT, NTRef
diff --git a/python/cdec/scfg/extractor.py b/python/cdec/scfg/extractor.py
index 0a45ddb8..1dfa2421 100644
--- a/python/cdec/scfg/extractor.py
+++ b/python/cdec/scfg/extractor.py
@@ -1,3 +1,5 @@
+import sys, os
+import re
 import StringIO
 from itertools import chain
 
@@ -32,7 +34,16 @@ class PhonyGrammar:
         pass
 
 class GrammarExtractor:
-    def __init__(self, config):
+    def __init__(self, cfg):
+        if isinstance(cfg, dict):
+            config = cfg
+        elif isinstance(cfg, str):
+            cfg_file = os.path.basename(cfg)
+            if not re.match(r'^\w+\.py$', cfg_file):
+                raise ValueError('Config must be a *.py file')
+            sys.path.append(os.path.dirname(cfg))
+            config =  __import__(cfg_file.replace('.py', '')).__dict__
+            sys.path.pop()
         alignment = calignment.Alignment(config['a_file'], from_binary=True)
         self.factory = rulefactory.HieroCachingRuleFactory(
                 # compiled alignment object (REQUIRED)
@@ -99,13 +110,10 @@ class GrammarExtractor:
         return str(out)
 
 def main(config):
-    sys.path.append(os.path.dirname(config))
-    module =  __import__(os.path.basename(config).replace('.py', ''))
-    extractor = GrammarExtractor(module.__dict__)
-    print extractor.grammar(next(sys.stdin))
+    extractor = GrammarExtractor(config)
+    sys.stdout.write(extractor.grammar(next(sys.stdin)))
 
 if __name__ == '__main__':
-    import sys, os
     if len(sys.argv) != 2 or not sys.argv[1].endswith('.py'):
         sys.stderr.write('Usage: %s config.py\n' % sys.argv[0])
         sys.exit(1)
diff --git a/python/setup.py b/python/setup.py
index cc8b289d..701841a4 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -1,30 +1,50 @@
 from distutils.core import setup
 from distutils.extension import Extension
-from Cython.Distutils import build_ext
+import sys
 import os
+import glob
 
 INC = ['..', 'src/', '../decoder', '../utils', '../mteval']
 LIB = ['../decoder', '../utils', '../mteval', '../training', '../klm/lm', '../klm/util']
+LINK_ARGS = []
 
+# Detect Boost
 BOOST_ROOT = os.getenv('BOOST_ROOT')
 if BOOST_ROOT:
-    INC.append(os.path.join(BOOST_ROOT, 'include/'))
-    LIB.append(os.path.join(BOOST_ROOT, 'lib/'))
+    BOOST_INC = os.path.join(BOOST_ROOT, 'include')
+    BOOST_LIB = os.path.join(BOOST_ROOT, 'lib')
+    if not os.path.exists(BOOST_INC):
+        sys.stderr.write('Error: could not find Boost headers in <%s>\n' % BOOST_INC)
+        sys.exit(1)
+    if not os.path.exists(BOOST_LIB):
+        sys.stderr.write('Error: could not find Boost libraries in <%s>\n' % BOOST_LIB)
+        sys.exit(1)
+    INC.append(BOOST_INC)
+    LIB.append(BOOST_LIB)
+    LINK_ARGS += ['-Wl,-rpath', '-Wl,'+BOOST_LIB]
+else:
+    BOOST_LIB = '/usr/local/lib'
+
+# Detect -mt
+if glob.glob(os.path.join(BOOST_LIB, 'libboost_program_options-mt.*')):
+    BOOST_PROGRAM_OPTIONS = 'boost_program_options-mt'
+else:
+    BOOST_PROGRAM_OPTIONS = 'boost_program_options'
 
 ext_modules = [
     Extension(name='_cdec',
-        sources=['src/_cdec.pyx'],
+        sources=['src/_cdec.cpp'],
         language='C++', 
         include_dirs=INC,
         library_dirs=LIB,
-        libraries=['boost_program_options-mt', 'z',
+        libraries=[BOOST_PROGRAM_OPTIONS, 'z',
                    'cdec', 'utils', 'mteval', 'training', 'klm', 'klm_util'],
-        extra_compile_args=['-DHAVE_CONFIG_H']),
+        extra_compile_args=['-DHAVE_CONFIG_H'],
+        extra_link_args=LINK_ARGS),
 ]
 
 setup(
     name='cdec',
-    cmdclass={'build_ext': build_ext},
     ext_modules=ext_modules,
     packages=['cdec', 'cdec.scfg']
 )
diff --git a/python/src/_cdec.cpp b/python/src/_cdec.cpp
index e86dcf7b..3c95ca50 100644
--- a/python/src/_cdec.cpp
+++ b/python/src/_cdec.cpp
@@ -1,4 +1,4 @@
-/* Generated by Cython 0.16 on Wed Jul 11 16:05:22 2012 */
+/* Generated by Cython 0.16 on Fri Jul 20 18:16:48 2012 */
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
@@ -286,14 +286,16 @@
 #include "utils/sampler.h"
 #include <boost/shared_ptr.hpp>
 #include <boost/program_options.hpp>
-#include "decoder/lattice.h"
 #include "decoder/trule.h"
+#include "decoder/grammar.h"
+#include "decoder/lattice.h"
 #include "decoder/hg.h"
 #include "decoder/viterbi.h"
 #include "decoder/hg_io.h"
 #include "decoder/hg_intersect.h"
 #include "decoder/hg_sampler.h"
 #include "decoder/csplit.h"
+#include "decoder/inside_outside.h"
 #include "decoder/ff_register.h"
 #include "decoder/decoder.h"
 #include "observer.h"
@@ -384,57 +386,64 @@ static const char *__pyx_filename;
 static const char *__pyx_f[] = {
   "_cdec.pyx",
   "vectors.pxi",
+  "grammar.pxi",
   "hypergraph.pxi",
   "lattice.pxi",
-  "trule.pxi",
   "mteval.pxi",
 };
 
 /*--- Type declarations ---*/
 struct __pyx_obj_5_cdec_Scorer;
-struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config;
-struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr;
-struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr;
-struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__;
+struct __pyx_obj_5_cdec_NTRef;
+struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr;
+struct __pyx_obj_5_cdec_Grammar;
 struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__;
-struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__;
-struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot;
+struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase;
 struct __pyx_obj_5_cdec_CandidateSet;
 struct __pyx_obj_5_cdec___pyx_scope_struct_14___get__;
+struct __pyx_obj_5_cdec_BaseTRule;
 struct __pyx_obj_5_cdec_TRule;
-struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees;
+struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr;
 struct __pyx_obj_5_cdec_SegmentEvaluator;
-struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features;
-struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample;
+struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__;
 struct __pyx_obj_5_cdec_Candidate;
-struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr;
+struct __pyx_obj_5_cdec_NT;
 struct __pyx_obj_5_cdec_HypergraphEdge;
 struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__;
-struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__;
 struct __pyx_obj_5_cdec_Decoder;
 struct __pyx_obj_5_cdec_HypergraphNode;
 struct __pyx_obj_5_cdec_SparseVector;
-struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr;
+struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__;
 struct __pyx_obj_5_cdec___pyx_scope_struct_12___get__;
-struct __pyx_obj_5_cdec___pyx_scope_struct____iter__;
-struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest;
+struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__;
 struct __pyx_obj_5_cdec_DenseVector;
-struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines;
+struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__;
 struct __pyx_obj_5_cdec_SufficientStats;
-struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot;
+struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest;
+struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features;
+struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees;
 struct __pyx_obj_5_cdec_Hypergraph;
 struct __pyx_obj_5_cdec_Lattice;
-struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase;
-struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__;
-struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample;
+struct __pyx_obj_5_cdec___pyx_scope_struct____iter__;
+struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config;
+struct __pyx_obj_5_cdec_TextGrammar;
+struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines;
 struct __pyx_opt_args_5_cdec_as_str;
 
 /* "_cdec.pyx":6
  * cimport decoder
  * 
- * cdef char* as_str(sentence, error_msg='Cannot convert type %s to str'):             # <<<<<<<<<<<<<<
+ * cdef char* as_str(data, error_msg='Cannot convert type %s to str'):             # <<<<<<<<<<<<<<
  *     cdef bytes ret
- *     if isinstance(sentence, unicode):
+ *     if isinstance(data, unicode):
  */
 struct __pyx_opt_args_5_cdec_as_str {
   int __pyx_n;
@@ -454,39 +463,42 @@ struct __pyx_obj_5_cdec_Scorer {
 };
 
 
-/* "_cdec.pyx":27
- * class ParseFailed(Exception): pass
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":18
+ *         return '[%s]' % self.cat
  * 
- * def _make_config(config):             # <<<<<<<<<<<<<<
- *     for key, value in config.items():
- *         if isinstance(value, dict):
+ * cdef class NTRef:             # <<<<<<<<<<<<<<
+ *     cdef public unsigned ref
+ *     def __init__(self, ref):
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config {
+struct __pyx_obj_5_cdec_NTRef {
+  PyObject_HEAD
+  unsigned int ref;
+};
+
+
+/* "_cdec.pyx":43
+ *     cdef DenseVector weights
+ * 
+ *     def __cinit__(self, config_str=None, **config):             # <<<<<<<<<<<<<<
+ *         """ Configuration can be given as a string:
+ *                 Decoder('formalism = scfg')
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ {
   PyObject_HEAD
   PyObject *__pyx_v_config;
-  PyObject *__pyx_v_info;
-  PyObject *__pyx_v_key;
-  PyObject *__pyx_v_name;
-  PyObject *__pyx_v_value;
-  PyObject *__pyx_t_0;
-  PyObject *__pyx_t_1;
-  Py_ssize_t __pyx_t_2;
-  PyObject *(*__pyx_t_3)(PyObject *);
-  Py_ssize_t __pyx_t_4;
-  PyObject *(*__pyx_t_5)(PyObject *);
 };
 
 
-/* "_cdec.pyx":53
+/* "_cdec.pyx":54
  *                     'csplit', 'tagger', 'lexalign'):
  *                 raise InvalidConfig('formalism "%s" unknown' % formalism)
  *             config_str = '\n'.join('%s = %s' % kv for kv in _make_config(config))             # <<<<<<<<<<<<<<
  *         cdef istringstream* config_stream = new istringstream(config_str)
  *         self.dec = new decoder.Decoder(config_stream)
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr {
+struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr {
   PyObject_HEAD
-  struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *__pyx_outer_scope;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *__pyx_outer_scope;
   PyObject *__pyx_v_kv;
   PyObject *__pyx_t_0;
   Py_ssize_t __pyx_t_1;
@@ -494,80 +506,58 @@ struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/trule.pxi":2
- * def _phrase(phrase):
- *     return ' '.join('[%s,%d]' % w if isinstance(w, tuple) else w.encode('utf8') for w in phrase)             # <<<<<<<<<<<<<<
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":146
+ *         self.rule.get().ComputeArity()
  * 
- * cdef class TRule:
- */
-struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr {
-  PyObject_HEAD
-  struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *__pyx_outer_scope;
-  PyObject *__pyx_v_w;
-  PyObject *__pyx_t_0;
-  Py_ssize_t __pyx_t_1;
-  PyObject *(*__pyx_t_2)(PyObject *);
-};
-
-
-/* "/Users/vchahun/Sandbox/cdec/python/src/trule.pxi":53
- *             return TDConvert(-self.rule.lhs_)
+ * cdef class Grammar:             # <<<<<<<<<<<<<<
+ *     cdef shared_ptr[grammar.Grammar]* grammar
  * 
- *     def __str__(self):             # <<<<<<<<<<<<<<
- *         scores = ' '.join('%s=%s' % feat for feat in self.scores)
- *         return '[%s] ||| %s ||| %s ||| %s' % (self.lhs, _phrase(self.f), _phrase(self.e), scores)
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ {
+struct __pyx_obj_5_cdec_Grammar {
   PyObject_HEAD
-  struct __pyx_obj_5_cdec_TRule *__pyx_v_self;
+  boost::shared_ptr<Grammar> *grammar;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":189
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":119
  * 
- *     property in_edges:
+ *     property nodes:
  *         def __get__(self):             # <<<<<<<<<<<<<<
  *             cdef unsigned i
- *             for i in range(self.node.in_edges_.size()):
+ *             for i in range(self.hg.nodes_.size()):
  */
 struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__ {
   PyObject_HEAD
   unsigned int __pyx_v_i;
-  struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_self;
+  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
   size_t __pyx_t_0;
   unsigned int __pyx_t_1;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":49
- *         return hypergraph.AsPLF(self.lattice[0], True).c_str()
+/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":57
+ *         del self.lattice
  * 
- *     def __iter__(self):             # <<<<<<<<<<<<<<
- *         cdef unsigned i
- *         for i in range(len(self)):
+ *     def todot(self):             # <<<<<<<<<<<<<<
+ *         def lines():
+ *             yield 'digraph lattice {'
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__ {
+struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot {
   PyObject_HEAD
-  unsigned int __pyx_v_i;
   struct __pyx_obj_5_cdec_Lattice *__pyx_v_self;
-  Py_ssize_t __pyx_t_0;
-  unsigned int __pyx_t_1;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":121
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":3
+ * cimport grammar
+ * 
+ * def _phrase(phrase):             # <<<<<<<<<<<<<<
+ *     return ' '.join(w.encode('utf8') if isinstance(w, unicode) else str(w) for w in phrase)
  * 
- *     property nodes:
- *         def __get__(self):             # <<<<<<<<<<<<<<
- *             cdef unsigned i
- *             for i in range(self.hg.nodes_.size()):
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ {
+struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase {
   PyObject_HEAD
-  unsigned int __pyx_v_i;
-  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
-  size_t __pyx_t_0;
-  unsigned int __pyx_t_1;
+  PyObject *__pyx_v_phrase;
 };
 
 
@@ -586,55 +576,61 @@ struct __pyx_obj_5_cdec_CandidateSet {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":195
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":167
  * 
- *     property out_edges:
+ *     property tail_nodes:
  *         def __get__(self):             # <<<<<<<<<<<<<<
  *             cdef unsigned i
- *             for i in range(self.node.out_edges_.size()):
+ *             for i in range(self.edge.tail_nodes_.size()):
  */
 struct __pyx_obj_5_cdec___pyx_scope_struct_14___get__ {
   PyObject_HEAD
   unsigned int __pyx_v_i;
-  struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_self;
-  size_t __pyx_t_0;
+  struct __pyx_obj_5_cdec_HypergraphEdge *__pyx_v_self;
+  unsigned int __pyx_t_0;
   unsigned int __pyx_t_1;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/trule.pxi":4
- *     return ' '.join('[%s,%d]' % w if isinstance(w, tuple) else w.encode('utf8') for w in phrase)
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":26
+ *         return '[%d]' % self.ref
  * 
- * cdef class TRule:             # <<<<<<<<<<<<<<
- *     cdef hypergraph.TRule* rule
+ * cdef class BaseTRule:             # <<<<<<<<<<<<<<
+ *     cdef shared_ptr[grammar.TRule]* rule
  * 
  */
-struct __pyx_obj_5_cdec_TRule {
+struct __pyx_obj_5_cdec_BaseTRule {
   PyObject_HEAD
-  TRule *rule;
+  boost::shared_ptr<TRule> *rule;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":43
- *             del derivations
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":135
+ *                 _phrase(self.f), _phrase(self.e), scores)
  * 
- *     def kbest_trees(self, size):             # <<<<<<<<<<<<<<
- *         cdef kbest.KBestDerivations[vector[WordID], kbest.FTreeTraversal]* f_derivations = new kbest.KBestDerivations[vector[WordID], kbest.FTreeTraversal](self.hg[0], size)
- *         cdef kbest.KBestDerivations[vector[WordID], kbest.FTreeTraversal].Derivation* f_derivation
+ * cdef class TRule(BaseTRule):             # <<<<<<<<<<<<<<
+ *     def __cinit__(self, lhs, f, e, scores, a=None):
+ *         self.rule = new shared_ptr[grammar.TRule](new grammar.TRule())
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees {
+struct __pyx_obj_5_cdec_TRule {
+  struct __pyx_obj_5_cdec_BaseTRule __pyx_base;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":4
+ * 
+ * def _phrase(phrase):
+ *     return ' '.join(w.encode('utf8') if isinstance(w, unicode) else str(w) for w in phrase)             # <<<<<<<<<<<<<<
+ * 
+ * cdef class NT:
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr {
   PyObject_HEAD
-  KBest::KBestDerivations<std::vector<WordID>,ETreeTraversal>::Derivation *__pyx_v_e_derivation;
-  KBest::KBestDerivations<std::vector<WordID>,ETreeTraversal> *__pyx_v_e_derivations;
-  PyObject *__pyx_v_e_tree;
-  KBest::KBestDerivations<std::vector<WordID>,FTreeTraversal>::Derivation *__pyx_v_f_derivation;
-  KBest::KBestDerivations<std::vector<WordID>,FTreeTraversal> *__pyx_v_f_derivations;
-  PyObject *__pyx_v_f_tree;
-  unsigned int __pyx_v_k;
-  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
-  PyObject *__pyx_v_size;
-  unsigned int __pyx_t_0;
-  long __pyx_t_1;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *__pyx_outer_scope;
+  PyObject *__pyx_v_w;
+  PyObject *__pyx_t_0;
+  Py_ssize_t __pyx_t_1;
+  PyObject *(*__pyx_t_2)(PyObject *);
 };
 
 
@@ -652,41 +648,20 @@ struct __pyx_obj_5_cdec_SegmentEvaluator {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":61
- *             del e_derivations
- * 
- *     def kbest_features(self, size):             # <<<<<<<<<<<<<<
- *         cdef kbest.KBestDerivations[FastSparseVector[weight_t], kbest.FeatureVectorTraversal]* derivations = new kbest.KBestDerivations[FastSparseVector[weight_t], kbest.FeatureVectorTraversal](self.hg[0], size)
- *         cdef kbest.KBestDerivations[FastSparseVector[weight_t], kbest.FeatureVectorTraversal].Derivation* derivation
- */
-struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features {
-  PyObject_HEAD
-  KBest::KBestDerivations<FastSparseVector<weight_t>,FeatureVectorTraversal>::Derivation *__pyx_v_derivation;
-  KBest::KBestDerivations<FastSparseVector<weight_t>,FeatureVectorTraversal> *__pyx_v_derivations;
-  struct __pyx_obj_5_cdec_SparseVector *__pyx_v_fmap;
-  unsigned int __pyx_v_k;
-  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
-  PyObject *__pyx_v_size;
-  unsigned int __pyx_t_0;
-  long __pyx_t_1;
-};
-
-
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":76
- *             del derivations
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":44
+ *         return self.stats.size()
  * 
- *     def sample(self, unsigned n):             # <<<<<<<<<<<<<<
- *         cdef vector[hypergraph.Hypothesis]* hypos = new vector[hypergraph.Hypothesis]()
- *         if self.rng == NULL:
+ *     def __iter__(self):             # <<<<<<<<<<<<<<
+ *         for i in range(len(self)):
+ *             yield self.stats[0][i]
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample {
+struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__ {
   PyObject_HEAD
-  std::vector<HypergraphSampler::Hypothesis> *__pyx_v_hypos;
-  unsigned int __pyx_v_k;
-  unsigned int __pyx_v_n;
-  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
-  size_t __pyx_t_0;
-  unsigned int __pyx_t_1;
+  PyObject *__pyx_v_i;
+  struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_self;
+  Py_ssize_t __pyx_t_0;
+  PyObject *__pyx_t_1;
+  PyObject *(*__pyx_t_2)(PyObject *);
 };
 
 
@@ -704,24 +679,39 @@ struct __pyx_obj_5_cdec_Candidate {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":115
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":131
  * 
- *     property edges:
- *         def __get__(self):             # <<<<<<<<<<<<<<
- *             cdef unsigned i
- *             for i in range(self.hg.edges_.size()):
+ *     def __str__(self):
+ *         scores = ' '.join('%s=%s' % feat for feat in self.scores)             # <<<<<<<<<<<<<<
+ *         return '%s ||| %s ||| %s ||| %s' % (self.lhs,
+ *                 _phrase(self.f), _phrase(self.e), scores)
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ {
+struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr {
   PyObject_HEAD
-  unsigned int __pyx_v_i;
-  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
-  size_t __pyx_t_0;
-  unsigned int __pyx_t_1;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *__pyx_outer_scope;
+  PyObject *__pyx_v_feat;
+  PyObject *__pyx_t_0;
+  Py_ssize_t __pyx_t_1;
+  PyObject *(*__pyx_t_2)(PyObject *);
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":133
- * include "trule.pxi"
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":6
+ *     return ' '.join(w.encode('utf8') if isinstance(w, unicode) else str(w) for w in phrase)
+ * 
+ * cdef class NT:             # <<<<<<<<<<<<<<
+ *     cdef public char* cat
+ *     cdef public unsigned ref
+ */
+struct __pyx_obj_5_cdec_NT {
+  PyObject_HEAD
+  char *cat;
+  unsigned int ref;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":147
+ *         return vector
  * 
  * cdef class HypergraphEdge:             # <<<<<<<<<<<<<<
  *     cdef hypergraph.Hypergraph* hg
@@ -732,7 +722,7 @@ struct __pyx_obj_5_cdec_HypergraphEdge {
   struct __pyx_vtabstruct_5_cdec_HypergraphEdge *__pyx_vtab;
   Hypergraph *hg;
   const Hypergraph::Edge *edge;
-  struct __pyx_obj_5_cdec_TRule *trule;
+  struct __pyx_obj_5_cdec_BaseTRule *trule;
 };
 
 
@@ -741,36 +731,52 @@ struct __pyx_obj_5_cdec_HypergraphEdge {
  * 
  *     def __iter__(self):             # <<<<<<<<<<<<<<
  *         cdef FastSparseVector[weight_t].const_iterator* it = new FastSparseVector[weight_t].const_iterator(self.vector[0], False)
- *         try:
+ *         cdef unsigned i
  */
 struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ {
   PyObject_HEAD
-  size_t __pyx_v_i;
+  unsigned int __pyx_v_i;
   FastSparseVector<weight_t>::const_iterator *__pyx_v_it;
   struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self;
   size_t __pyx_t_0;
-  size_t __pyx_t_1;
+  unsigned int __pyx_t_1;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":44
- *         return self.stats.size()
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":209
  * 
- *     def __iter__(self):             # <<<<<<<<<<<<<<
- *         for i in range(len(self)):
- *             yield self.stats[0][i]
+ *     property out_edges:
+ *         def __get__(self):             # <<<<<<<<<<<<<<
+ *             cdef unsigned i
+ *             for i in range(self.node.out_edges_.size()):
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__ {
+struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ {
   PyObject_HEAD
-  PyObject *__pyx_v_i;
-  struct __pyx_obj_5_cdec_SufficientStats *__pyx_v_self;
-  Py_ssize_t __pyx_t_0;
-  PyObject *__pyx_t_1;
-  PyObject *(*__pyx_t_2)(PyObject *);
+  unsigned int __pyx_v_i;
+  struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_self;
+  size_t __pyx_t_0;
+  unsigned int __pyx_t_1;
 };
 
 
-/* "_cdec.pyx":38
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":90
+ * 
+ *     property a:
+ *         def __get__(self):             # <<<<<<<<<<<<<<
+ *             cdef unsigned i
+ *             cdef vector[grammar.AlignmentPoint]* a = &self.rule.get().a_
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__ {
+  PyObject_HEAD
+  std::vector<AlignmentPoint> *__pyx_v_a;
+  unsigned int __pyx_v_i;
+  struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self;
+  size_t __pyx_t_0;
+  unsigned int __pyx_t_1;
+};
+
+
+/* "_cdec.pyx":39
  *             yield key, bytes(value)
  * 
  * cdef class Decoder:             # <<<<<<<<<<<<<<
@@ -784,7 +790,7 @@ struct __pyx_obj_5_cdec_Decoder {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":179
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":193
  *         raise NotImplemented('comparison not implemented for HypergraphEdge')
  * 
  * cdef class HypergraphNode:             # <<<<<<<<<<<<<<
@@ -812,54 +818,100 @@ struct __pyx_obj_5_cdec_SparseVector {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/trule.pxi":54
+/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":49
+ *         return hypergraph.AsPLF(self.lattice[0], True).c_str()
  * 
- *     def __str__(self):
- *         scores = ' '.join('%s=%s' % feat for feat in self.scores)             # <<<<<<<<<<<<<<
- *         return '[%s] ||| %s ||| %s ||| %s' % (self.lhs, _phrase(self.f), _phrase(self.e), scores)
+ *     def __iter__(self):             # <<<<<<<<<<<<<<
+ *         cdef unsigned i
+ *         for i in range(len(self)):
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr {
+struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__ {
   PyObject_HEAD
-  struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *__pyx_outer_scope;
-  PyObject *__pyx_v_feat;
-  PyObject *__pyx_t_0;
-  Py_ssize_t __pyx_t_1;
-  PyObject *(*__pyx_t_2)(PyObject *);
+  unsigned int __pyx_v_i;
+  struct __pyx_obj_5_cdec_Lattice *__pyx_v_self;
+  Py_ssize_t __pyx_t_0;
+  unsigned int __pyx_t_1;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":153
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":113
  * 
- *     property tail_nodes:
+ *     property edges:
  *         def __get__(self):             # <<<<<<<<<<<<<<
  *             cdef unsigned i
- *             for i in range(self.edge.tail_nodes_.size()):
+ *             for i in range(self.hg.edges_.size()):
  */
 struct __pyx_obj_5_cdec___pyx_scope_struct_12___get__ {
   PyObject_HEAD
   unsigned int __pyx_v_i;
-  struct __pyx_obj_5_cdec_HypergraphEdge *__pyx_v_self;
-  unsigned int __pyx_t_0;
+  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
+  size_t __pyx_t_0;
   unsigned int __pyx_t_1;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":22
- *         self.vector[0][fid] = value
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":85
+ *         return candidate
  * 
  *     def __iter__(self):             # <<<<<<<<<<<<<<
- *         cdef unsigned fid
- *         for fid in range(1, self.vector.size()):
+ *         cdef unsigned i
+ *         for i in range(len(self)):
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct____iter__ {
+struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__ {
   PyObject_HEAD
-  unsigned int __pyx_v_fid;
-  struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self;
-  size_t __pyx_t_0;
+  unsigned int __pyx_v_i;
+  struct __pyx_obj_5_cdec_CandidateSet *__pyx_v_self;
+  Py_ssize_t __pyx_t_0;
   unsigned int __pyx_t_1;
 };
 
 
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":3
+ * from cython.operator cimport preincrement as pinc
+ * 
+ * cdef class DenseVector:             # <<<<<<<<<<<<<<
+ *     cdef vector[weight_t]* vector # Not owned by DenseVector
+ * 
+ */
+struct __pyx_obj_5_cdec_DenseVector {
+  PyObject_HEAD
+  std::vector<weight_t> *vector;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":152
+ *         del self.grammar
+ * 
+ *     def __iter__(self):             # <<<<<<<<<<<<<<
+ *         cdef grammar.GrammarIter* root = self.grammar.get().GetRoot()
+ *         cdef grammar.RuleBin* rbin = root.GetRules()
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__ {
+  PyObject_HEAD
+  unsigned int __pyx_v_i;
+  const RuleBin *__pyx_v_rbin;
+  const GrammarIter *__pyx_v_root;
+  struct __pyx_obj_5_cdec_Grammar *__pyx_v_self;
+  struct __pyx_obj_5_cdec_TRule *__pyx_v_trule;
+  int __pyx_t_0;
+  unsigned int __pyx_t_1;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":26
+ *             return fmap
+ * 
+ * cdef class SufficientStats:             # <<<<<<<<<<<<<<
+ *     cdef mteval.SufficientStats* stats
+ *     cdef mteval.EvaluationMetric* metric
+ */
+struct __pyx_obj_5_cdec_SufficientStats {
+  PyObject_HEAD
+  SufficientStats *stats;
+  EvaluationMetric *metric;
+};
+
+
 /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":31
  *         return unicode(hypergraph.JoshuaVisualizationString(self.hg[0]).c_str(), 'utf8')
  * 
@@ -867,7 +919,7 @@ struct __pyx_obj_5_cdec___pyx_scope_struct____iter__ {
  *         cdef kbest.KBestDerivations[vector[WordID], kbest.ESentenceTraversal]* derivations = new kbest.KBestDerivations[vector[WordID], kbest.ESentenceTraversal](self.hg[0], size)
  *         cdef kbest.KBestDerivations[vector[WordID], kbest.ESentenceTraversal].Derivation* derivation
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest {
+struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest {
   PyObject_HEAD
   KBest::KBestDerivations<std::vector<WordID>,ESentenceTraversal>::Derivation *__pyx_v_derivation;
   KBest::KBestDerivations<std::vector<WordID>,ESentenceTraversal> *__pyx_v_derivations;
@@ -879,66 +931,75 @@ struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":3
- * from cython.operator cimport preincrement as pinc
- * 
- * cdef class DenseVector:             # <<<<<<<<<<<<<<
- *     cdef vector[weight_t]* vector # Not owned by DenseVector
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":61
+ *             del e_derivations
  * 
+ *     def kbest_features(self, size):             # <<<<<<<<<<<<<<
+ *         cdef kbest.KBestDerivations[FastSparseVector[weight_t], kbest.FeatureVectorTraversal]* derivations = new kbest.KBestDerivations[FastSparseVector[weight_t], kbest.FeatureVectorTraversal](self.hg[0], size)
+ *         cdef kbest.KBestDerivations[FastSparseVector[weight_t], kbest.FeatureVectorTraversal].Derivation* derivation
  */
-struct __pyx_obj_5_cdec_DenseVector {
+struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features {
   PyObject_HEAD
-  std::vector<weight_t> *vector;
+  KBest::KBestDerivations<FastSparseVector<weight_t>,FeatureVectorTraversal>::Derivation *__pyx_v_derivation;
+  KBest::KBestDerivations<FastSparseVector<weight_t>,FeatureVectorTraversal> *__pyx_v_derivations;
+  struct __pyx_obj_5_cdec_SparseVector *__pyx_v_fmap;
+  unsigned int __pyx_v_k;
+  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
+  PyObject *__pyx_v_size;
+  unsigned int __pyx_t_0;
+  long __pyx_t_1;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":58
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":203
  * 
- *     def todot(self):
- *         def lines():             # <<<<<<<<<<<<<<
- *             yield 'digraph lattice {'
- *             yield 'rankdir = LR;'
+ *     property in_edges:
+ *         def __get__(self):             # <<<<<<<<<<<<<<
+ *             cdef unsigned i
+ *             for i in range(self.node.in_edges_.size()):
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines {
+struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ {
   PyObject_HEAD
-  struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *__pyx_outer_scope;
-  PyObject *__pyx_v_delta;
-  PyObject *__pyx_v_i;
-  PyObject *__pyx_v_label;
-  PyObject *__pyx_v_weight;
-  Py_ssize_t __pyx_t_0;
-  PyObject *__pyx_t_1;
-  PyObject *(*__pyx_t_2)(PyObject *);
-  PyObject *__pyx_t_3;
-  Py_ssize_t __pyx_t_4;
-  PyObject *(*__pyx_t_5)(PyObject *);
+  unsigned int __pyx_v_i;
+  struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_self;
+  size_t __pyx_t_0;
+  unsigned int __pyx_t_1;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":26
- *             return fmap
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":130
+ *             self.rule.get().lhs_ = -TDConvert(<char *>lhs.cat)
  * 
- * cdef class SufficientStats:             # <<<<<<<<<<<<<<
- *     cdef mteval.SufficientStats* stats
- *     cdef mteval.EvaluationMetric* metric
+ *     def __str__(self):             # <<<<<<<<<<<<<<
+ *         scores = ' '.join('%s=%s' % feat for feat in self.scores)
+ *         return '%s ||| %s ||| %s ||| %s' % (self.lhs,
  */
-struct __pyx_obj_5_cdec_SufficientStats {
+struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ {
   PyObject_HEAD
-  SufficientStats *stats;
-  EvaluationMetric *metric;
+  struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self;
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":57
- *         del self.lattice
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":43
+ *             del derivations
  * 
- *     def todot(self):             # <<<<<<<<<<<<<<
- *         def lines():
- *             yield 'digraph lattice {'
+ *     def kbest_trees(self, size):             # <<<<<<<<<<<<<<
+ *         cdef kbest.KBestDerivations[vector[WordID], kbest.FTreeTraversal]* f_derivations = new kbest.KBestDerivations[vector[WordID], kbest.FTreeTraversal](self.hg[0], size)
+ *         cdef kbest.KBestDerivations[vector[WordID], kbest.FTreeTraversal].Derivation* f_derivation
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot {
+struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees {
   PyObject_HEAD
-  struct __pyx_obj_5_cdec_Lattice *__pyx_v_self;
+  KBest::KBestDerivations<std::vector<WordID>,ETreeTraversal>::Derivation *__pyx_v_e_derivation;
+  KBest::KBestDerivations<std::vector<WordID>,ETreeTraversal> *__pyx_v_e_derivations;
+  PyObject *__pyx_v_e_tree;
+  KBest::KBestDerivations<std::vector<WordID>,FTreeTraversal>::Derivation *__pyx_v_f_derivation;
+  KBest::KBestDerivations<std::vector<WordID>,FTreeTraversal> *__pyx_v_f_derivations;
+  PyObject *__pyx_v_f_tree;
+  unsigned int __pyx_v_k;
+  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
+  PyObject *__pyx_v_size;
+  unsigned int __pyx_t_0;
+  long __pyx_t_1;
 };
 
 
@@ -969,48 +1030,100 @@ struct __pyx_obj_5_cdec_Lattice {
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/trule.pxi":1
- * def _phrase(phrase):             # <<<<<<<<<<<<<<
- *     return ' '.join('[%s,%d]' % w if isinstance(w, tuple) else w.encode('utf8') for w in phrase)
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":76
+ *             del derivations
  * 
+ *     def sample(self, unsigned n):             # <<<<<<<<<<<<<<
+ *         cdef vector[hypergraph.Hypothesis]* hypos = new vector[hypergraph.Hypothesis]()
+ *         if self.rng == NULL:
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase {
+struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample {
   PyObject_HEAD
-  PyObject *__pyx_v_phrase;
+  std::vector<HypergraphSampler::Hypothesis> *__pyx_v_hypos;
+  unsigned int __pyx_v_k;
+  unsigned int __pyx_v_n;
+  struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self;
+  size_t __pyx_t_0;
+  unsigned int __pyx_t_1;
 };
 
 
-/* "_cdec.pyx":42
- *     cdef DenseVector weights
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":22
+ *         self.vector[0][fid] = value
  * 
- *     def __cinit__(self, config_str=None, **config):             # <<<<<<<<<<<<<<
- *         """ Configuration can be given as a string:
- *                 Decoder('formalism = scfg')
+ *     def __iter__(self):             # <<<<<<<<<<<<<<
+ *         cdef unsigned fid
+ *         for fid in range(1, self.vector.size()):
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ {
+struct __pyx_obj_5_cdec___pyx_scope_struct____iter__ {
+  PyObject_HEAD
+  unsigned int __pyx_v_fid;
+  struct __pyx_obj_5_cdec_DenseVector *__pyx_v_self;
+  size_t __pyx_t_0;
+  unsigned int __pyx_t_1;
+};
+
+
+/* "_cdec.pyx":28
+ * class ParseFailed(Exception): pass
+ * 
+ * def _make_config(config):             # <<<<<<<<<<<<<<
+ *     for key, value in config.items():
+ *         if isinstance(value, dict):
+ */
+struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config {
   PyObject_HEAD
   PyObject *__pyx_v_config;
+  PyObject *__pyx_v_info;
+  PyObject *__pyx_v_key;
+  PyObject *__pyx_v_name;
+  PyObject *__pyx_v_value;
+  PyObject *__pyx_t_0;
+  PyObject *__pyx_t_1;
+  Py_ssize_t __pyx_t_2;
+  PyObject *(*__pyx_t_3)(PyObject *);
+  Py_ssize_t __pyx_t_4;
+  PyObject *(*__pyx_t_5)(PyObject *);
 };
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":85
- *         return candidate
+/* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":169
+ *             self.grammar.get().SetGrammarName(string(<char *>name))
  * 
- *     def __iter__(self):             # <<<<<<<<<<<<<<
- *         cdef unsigned i
- *         for i in range(len(self)):
+ * cdef class TextGrammar(Grammar):             # <<<<<<<<<<<<<<
+ *     def __cinit__(self, rules):
+ *         self.grammar = new shared_ptr[grammar.Grammar](new grammar.TextGrammar())
+ */
+struct __pyx_obj_5_cdec_TextGrammar {
+  struct __pyx_obj_5_cdec_Grammar __pyx_base;
+};
+
+
+/* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":58
+ * 
+ *     def todot(self):
+ *         def lines():             # <<<<<<<<<<<<<<
+ *             yield 'digraph lattice {'
+ *             yield 'rankdir = LR;'
  */
-struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__ {
+struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines {
   PyObject_HEAD
-  unsigned int __pyx_v_i;
-  struct __pyx_obj_5_cdec_CandidateSet *__pyx_v_self;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *__pyx_outer_scope;
+  PyObject *__pyx_v_delta;
+  PyObject *__pyx_v_i;
+  PyObject *__pyx_v_label;
+  PyObject *__pyx_v_weight;
   Py_ssize_t __pyx_t_0;
-  unsigned int __pyx_t_1;
+  PyObject *__pyx_t_1;
+  PyObject *(*__pyx_t_2)(PyObject *);
+  PyObject *__pyx_t_3;
+  Py_ssize_t __pyx_t_4;
+  PyObject *(*__pyx_t_5)(PyObject *);
 };
 
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":179
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":193
  *         raise NotImplemented('comparison not implemented for HypergraphEdge')
  * 
  * cdef class HypergraphNode:             # <<<<<<<<<<<<<<
@@ -1024,8 +1137,8 @@ struct __pyx_vtabstruct_5_cdec_HypergraphNode {
 static struct __pyx_vtabstruct_5_cdec_HypergraphNode *__pyx_vtabptr_5_cdec_HypergraphNode;
 
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":133
- * include "trule.pxi"
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":147
+ *         return vector
  * 
  * cdef class HypergraphEdge:             # <<<<<<<<<<<<<<
  *     cdef hypergraph.Hypergraph* hg
@@ -1102,6 +1215,8 @@ static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed
 
 static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type); /*proto*/
 
+static CYTHON_INLINE void __Pyx_RaiseClosureNameError(const char *varname);
+
 static void __Pyx_RaiseDoubleKeywordsError(const char* func_name, PyObject* kw_name); /*proto*/
 
 static int __Pyx_ParseOptionalKeywords(PyObject *kwds, PyObject **argnames[], \
@@ -1111,15 +1226,6 @@ static int __Pyx_ParseOptionalKeywords(PyObject *kwds, PyObject **argnames[], \
 static void __Pyx_RaiseArgtupleInvalid(const char* func_name, int exact,
     Py_ssize_t num_min, Py_ssize_t num_max, Py_ssize_t num_found); /*proto*/
 
-static CYTHON_INLINE int __Pyx_NegateNonNeg(int b) {
-    return unlikely(b < 0) ? b : !b;
-}
-static CYTHON_INLINE PyObject* __Pyx_PyBoolOrNull_FromLong(long b) {
-    return unlikely(b < 0) ? NULL : __Pyx_PyBool_FromLong(b);
-}
-
-static CYTHON_INLINE void __Pyx_RaiseClosureNameError(const char *varname);
-
 static CYTHON_INLINE PyObject* __Pyx_PyObject_Append(PyObject* L, PyObject* x) {
     if (likely(PyList_CheckExact(L))) {
         if (PyList_Append(L, x) < 0) return NULL;
@@ -1136,15 +1242,6 @@ static CYTHON_INLINE PyObject* __Pyx_PyObject_Append(PyObject* L, PyObject* x) {
     }
 }
 
-#define __Pyx_PyIter_Next(obj) __Pyx_PyIter_Next2(obj, NULL);
-static CYTHON_INLINE PyObject *__Pyx_PyIter_Next2(PyObject *, PyObject *); /*proto*/
-
-static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index);
-
-static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected);
-
-static int __Pyx_IternextUnpackEndCheck(PyObject *retval, Py_ssize_t expected); /*proto*/
-
 static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Generic(PyObject *o, PyObject* j) {
     PyObject *r;
     if (!j) return NULL;
@@ -1217,6 +1314,22 @@ static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Fast(PyObject *o, Py_ssize_t i)
     return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
 }
 
+static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index);
+
+static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected);
+
+static int __Pyx_IternextUnpackEndCheck(PyObject *retval, Py_ssize_t expected); /*proto*/
+
+static CYTHON_INLINE int __Pyx_NegateNonNeg(int b) {
+    return unlikely(b < 0) ? b : !b;
+}
+static CYTHON_INLINE PyObject* __Pyx_PyBoolOrNull_FromLong(long b) {
+    return unlikely(b < 0) ? NULL : __Pyx_PyBool_FromLong(b);
+}
+
+#define __Pyx_PyIter_Next(obj) __Pyx_PyIter_Next2(obj, NULL);
+static CYTHON_INLINE PyObject *__Pyx_PyIter_Next2(PyObject *, PyObject *); /*proto*/
+
 static double __Pyx__PyObject_AsDouble(PyObject* obj); /* proto */
 #define __Pyx_PyObject_AsDouble(obj) \
 ((likely(PyFloat_CheckExact(obj))) ? \
@@ -1232,6 +1345,8 @@ static PyObject *__Pyx_FindPy2Metaclass(PyObject *bases); /*proto*/
 static PyObject *__Pyx_CreateClass(PyObject *bases, PyObject *dict, PyObject *name,
                                    PyObject *modname); /*proto*/
 
+static CYTHON_INLINE WordID __Pyx_PyInt_from_py_WordID(PyObject *);
+
 static PyObject* __Pyx_Globals(void); /*proto*/
 
 #define __Pyx_CyFunction_USED 1
@@ -1378,6 +1493,8 @@ static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
 
 /* Module declarations from 'utils' */
 
+/* Module declarations from 'grammar' */
+
 /* Module declarations from 'lattice' */
 
 /* Module declarations from 'hypergraph' */
@@ -1391,8 +1508,13 @@ static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
 /* Module declarations from '_cdec' */
 static PyTypeObject *__pyx_ptype_5_cdec_DenseVector = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_SparseVector = 0;
-static PyTypeObject *__pyx_ptype_5_cdec_Hypergraph = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_NT = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_NTRef = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_BaseTRule = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_TRule = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_Grammar = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_TextGrammar = 0;
+static PyTypeObject *__pyx_ptype_5_cdec_Hypergraph = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_HypergraphEdge = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_HypergraphNode = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_Lattice = 0;
@@ -1404,27 +1526,29 @@ static PyTypeObject *__pyx_ptype_5_cdec_Scorer = 0;
 static PyTypeObject *__pyx_ptype_5_cdec_Decoder = 0;
 static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct____iter__ = 0;
 static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_1___iter__ = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_2_kbest = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_3_kbest_trees = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_4_kbest_features = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_5_sample = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_6___get__ = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_7___get__ = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_8__phrase = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_9_genexpr = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_10___str__ = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_11_genexpr = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_2__phrase = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_3_genexpr = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_4___get__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_5___str__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_6_genexpr = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_7___iter__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_8_kbest = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_9_kbest_trees = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_10_kbest_features = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_11_sample = 0;
 static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_12___get__ = 0;
 static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_13___get__ = 0;
 static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_14___get__ = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_15___iter__ = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_16_todot = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_17_lines = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_18___iter__ = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_19___iter__ = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_20__make_config = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_21___cinit__ = 0;
-static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_22_genexpr = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_15___get__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_16___get__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_17___iter__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_18_todot = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_19_lines = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_20___iter__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_21___iter__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_22__make_config = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_23___cinit__ = 0;
+static PyTypeObject *__pyx_ptype_5_cdec___pyx_scope_struct_24_genexpr = 0;
 static char *__pyx_f_5_cdec_as_str(PyObject *, struct __pyx_opt_args_5_cdec_as_str *__pyx_optional_args); /*proto*/
 static struct __pyx_obj_5_cdec_SufficientStats *__pyx_f_5_cdec_as_stats(PyObject *, PyObject *); /*proto*/
 #define __Pyx_MODULE_NAME "_cdec"
@@ -1436,6 +1560,7 @@ static PyObject *__pyx_builtin_TypeError;
 static PyObject *__pyx_builtin_KeyError;
 static PyObject *__pyx_builtin_range;
 static PyObject *__pyx_builtin_NotImplemented;
+static PyObject *__pyx_builtin_ValueError;
 static PyObject *__pyx_builtin_eval;
 static PyObject *__pyx_builtin_enumerate;
 static PyObject *__pyx_builtin_IndexError;
@@ -1468,6 +1593,38 @@ static PyObject *__pyx_pf_5_cdec_12SparseVector_33__mul__(PyObject *__pyx_v_x, P
 #if PY_MAJOR_VERSION < 3
 static PyObject *__pyx_pf_5_cdec_12SparseVector_35__div__(PyObject *__pyx_v_x, PyObject *__pyx_v_y); /* proto */
 #endif
+static PyObject *__pyx_pf_5_cdec_7_phrase_genexpr(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_pf_5_cdec__phrase(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_phrase); /* proto */
+static int __pyx_pf_5_cdec_2NT___init__(struct __pyx_obj_5_cdec_NT *__pyx_v_self, PyObject *__pyx_v_cat, PyObject *__pyx_v_ref); /* proto */
+static PyObject *__pyx_pf_5_cdec_2NT_2__str__(struct __pyx_obj_5_cdec_NT *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_2NT_3cat___get__(struct __pyx_obj_5_cdec_NT *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_2NT_3cat_2__set__(struct __pyx_obj_5_cdec_NT *__pyx_v_self, PyObject *__pyx_v_value); /* proto */
+static PyObject *__pyx_pf_5_cdec_2NT_3ref___get__(struct __pyx_obj_5_cdec_NT *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_2NT_3ref_2__set__(struct __pyx_obj_5_cdec_NT *__pyx_v_self, PyObject *__pyx_v_value); /* proto */
+static int __pyx_pf_5_cdec_5NTRef___init__(struct __pyx_obj_5_cdec_NTRef *__pyx_v_self, PyObject *__pyx_v_ref); /* proto */
+static PyObject *__pyx_pf_5_cdec_5NTRef_2__str__(struct __pyx_obj_5_cdec_NTRef *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_5NTRef_3ref___get__(struct __pyx_obj_5_cdec_NTRef *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_5NTRef_3ref_2__set__(struct __pyx_obj_5_cdec_NTRef *__pyx_v_self, PyObject *__pyx_v_value); /* proto */
+static void __pyx_pf_5_cdec_9BaseTRule___dealloc__(CYTHON_UNUSED struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_9BaseTRule_5arity___get__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_9BaseTRule_1f___get__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_9BaseTRule_1f_2__set__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self, PyObject *__pyx_v_f); /* proto */
+static PyObject *__pyx_pf_5_cdec_9BaseTRule_1e___get__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_9BaseTRule_1e_2__set__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self, PyObject *__pyx_v_e); /* proto */
+static PyObject *__pyx_pf_5_cdec_9BaseTRule_1a___get__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_9BaseTRule_1a_3__set__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self, PyObject *__pyx_v_a); /* proto */
+static PyObject *__pyx_pf_5_cdec_9BaseTRule_6scores___get__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_9BaseTRule_6scores_2__set__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self, PyObject *__pyx_v_scores); /* proto */
+static PyObject *__pyx_pf_5_cdec_9BaseTRule_3lhs___get__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_9BaseTRule_3lhs_2__set__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self, PyObject *__pyx_v_lhs); /* proto */
+static PyObject *__pyx_pf_5_cdec_9BaseTRule_7__str___genexpr(PyObject *__pyx_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_9BaseTRule_2__str__(struct __pyx_obj_5_cdec_BaseTRule *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_5TRule___cinit__(struct __pyx_obj_5_cdec_TRule *__pyx_v_self, PyObject *__pyx_v_lhs, PyObject *__pyx_v_f, PyObject *__pyx_v_e, PyObject *__pyx_v_scores, PyObject *__pyx_v_a); /* proto */
+static void __pyx_pf_5_cdec_7Grammar___dealloc__(CYTHON_UNUSED struct __pyx_obj_5_cdec_Grammar *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_7Grammar_2__iter__(struct __pyx_obj_5_cdec_Grammar *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_7Grammar_4name___get__(struct __pyx_obj_5_cdec_Grammar *__pyx_v_self); /* proto */
+static int __pyx_pf_5_cdec_7Grammar_4name_2__set__(struct __pyx_obj_5_cdec_Grammar *__pyx_v_self, PyObject *__pyx_v_name); /* proto */
+static int __pyx_pf_5_cdec_11TextGrammar___cinit__(struct __pyx_obj_5_cdec_TextGrammar *__pyx_v_self, PyObject *__pyx_v_rules); /* proto */
 static void __pyx_pf_5_cdec_10Hypergraph___dealloc__(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_2viterbi(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_4viterbi_trees(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
@@ -1484,15 +1641,8 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_28reweight(struct __pyx_obj_5_cdec
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_5edges___get__(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_5nodes___get__(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_10Hypergraph_4goal___get__(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_7_phrase_genexpr(PyObject *__pyx_self); /* proto */
-static PyObject *__pyx_pf_5_cdec__phrase(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_phrase); /* proto */
-static PyObject *__pyx_pf_5_cdec_5TRule_5arity___get__(struct __pyx_obj_5_cdec_TRule *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_5TRule_1f___get__(struct __pyx_obj_5_cdec_TRule *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_5TRule_1e___get__(struct __pyx_obj_5_cdec_TRule *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_5TRule_6scores___get__(struct __pyx_obj_5_cdec_TRule *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_5TRule_3lhs___get__(struct __pyx_obj_5_cdec_TRule *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_5TRule_7__str___genexpr(PyObject *__pyx_self); /* proto */
-static PyObject *__pyx_pf_5_cdec_5TRule___str__(struct __pyx_obj_5_cdec_TRule *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_6npaths___get__(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_5_cdec_10Hypergraph_30inside_outside(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self); /* proto */
 static Py_ssize_t __pyx_pf_5_cdec_14HypergraphEdge___len__(struct __pyx_obj_5_cdec_HypergraphEdge *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_14HypergraphEdge_9head_node___get__(struct __pyx_obj_5_cdec_HypergraphEdge *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_14HypergraphEdge_10tail_nodes___get__(struct __pyx_obj_5_cdec_HypergraphEdge *__pyx_v_self); /* proto */
@@ -1508,7 +1658,7 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphNode_9out_edges___get__(struct __py
 static PyObject *__pyx_pf_5_cdec_14HypergraphNode_4span___get__(struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_14HypergraphNode_3cat___get__(struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_5_cdec_14HypergraphNode___richcmp__(struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_x, struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_y, int __pyx_v_op); /* proto */
-static int __pyx_pf_5_cdec_7Lattice___init__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self, PyObject *__pyx_v_inp); /* proto */
+static int __pyx_pf_5_cdec_7Lattice___cinit__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self, PyObject *__pyx_v_inp); /* proto */
 static PyObject *__pyx_pf_5_cdec_7Lattice_2__getitem__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self, int __pyx_v_index); /* proto */
 static int __pyx_pf_5_cdec_7Lattice_4__setitem__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self, int __pyx_v_index, PyObject *__pyx_v_arcs); /* proto */
 static Py_ssize_t __pyx_pf_5_cdec_7Lattice_6__len__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self); /* proto */
@@ -1553,41 +1703,46 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_6translate(struct __pyx_obj_5_cdec_Dec
 static char __pyx_k_1[] = "Cannot convert type %s to str";
 static char __pyx_k_3[] = "cannot take the dot product of %s and SparseVector";
 static char __pyx_k_4[] = "comparison not implemented for SparseVector";
-static char __pyx_k_6[] = "csplit_preserve_full_word";
-static char __pyx_k_7[] = "cannot reweight hypergraph with %s";
+static char __pyx_k_7[] = " ";
 static char __pyx_k_8[] = "[%s,%d]";
-static char __pyx_k_10[] = " ";
+static char __pyx_k_9[] = "[%s]";
+static char __pyx_k_10[] = "[%d]";
 static char __pyx_k_11[] = "%s=%s";
-static char __pyx_k_12[] = "[%s] ||| %s ||| %s ||| %s";
-static char __pyx_k_13[] = "comparison not implemented for HypergraphEdge";
-static char __pyx_k_15[] = "comparison not implemented for HypergraphNode";
-static char __pyx_k_18[] = "Cannot create lattice from %s";
-static char __pyx_k_19[] = "lattice index out of range";
-static char __pyx_k_23[] = "digraph lattice {";
-  static char __pyx_k_24[] = "rankdir = LR;";
-  static char __pyx_k_25[] = "node [shape=circle];";
-  static char __pyx_k_26[] = "%d -> %d [label=\"%s\"];";
-  static char __pyx_k_27[] = "\"";
-  static char __pyx_k_28[] = "\\\"";
-  static char __pyx_k_30[] = "%d [shape=doublecircle]";
-static char __pyx_k_31[] = "}";
-static char __pyx_k_34[] = "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi";
-static char __pyx_k_35[] = "\n";
-static char __pyx_k_37[] = "candidate set index out of range";
-static char __pyx_k_39[] = "%s %s";
-static char __pyx_k_40[] = "%s = %s";
-static char __pyx_k_42[] = "formalism \"%s\" unknown";
-static char __pyx_k_43[] = "cannot initialize weights with %s";
-static char __pyx_k_44[] = "#";
-static char __pyx_k_48[] = "Cannot translate input type %s";
-static char __pyx_k_51[] = "/Users/vchahun/Sandbox/cdec/python/src/trule.pxi";
-static char __pyx_k_56[] = "/Users/vchahun/Sandbox/cdec/python/src/_cdec.pyx";
+static char __pyx_k_12[] = "%s ||| %s ||| %s ||| %s";
+static char __pyx_k_13[] = "the grammar should contain TRule objects";
+static char __pyx_k_15[] = "csplit_preserve_full_word";
+static char __pyx_k_16[] = "cannot reweight hypergraph with %s";
+static char __pyx_k_17[] = "comparison not implemented for HypergraphEdge";
+static char __pyx_k_19[] = "comparison not implemented for HypergraphNode";
+static char __pyx_k_22[] = "Cannot create lattice from %s";
+static char __pyx_k_23[] = "lattice index out of range";
+static char __pyx_k_27[] = "digraph lattice {";
+  static char __pyx_k_28[] = "rankdir = LR;";
+  static char __pyx_k_29[] = "node [shape=circle];";
+  static char __pyx_k_30[] = "%d -> %d [label=\"%s\"];";
+  static char __pyx_k_31[] = "\"";
+  static char __pyx_k_32[] = "\\\"";
+  static char __pyx_k_34[] = "%d [shape=doublecircle]";
+static char __pyx_k_35[] = "}";
+static char __pyx_k_38[] = "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi";
+static char __pyx_k_39[] = "\n";
+static char __pyx_k_41[] = "candidate set index out of range";
+static char __pyx_k_43[] = "%s %s";
+static char __pyx_k_44[] = "%s = %s";
+static char __pyx_k_46[] = "formalism \"%s\" unknown";
+static char __pyx_k_47[] = "cannot initialize weights with %s";
+static char __pyx_k_48[] = "#";
+static char __pyx_k_51[] = "Cannot translate input type %s";
+static char __pyx_k_54[] = "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi";
+static char __pyx_k_59[] = "/Users/vchahun/Sandbox/cdec/python/src/_cdec.pyx";
+static char __pyx_k__a[] = "a";
 static char __pyx_k__e[] = "e";
 static char __pyx_k__f[] = "f";
 static char __pyx_k__i[] = "i";
 static char __pyx_k__k[] = "k";
 static char __pyx_k__pb[] = "pb";
 static char __pyx_k__TER[] = "TER";
+static char __pyx_k__cat[] = "cat";
 static char __pyx_k__dot[] = "dot";
 static char __pyx_k__fst[] = "fst";
 static char __pyx_k__get[] = "get";
@@ -1595,6 +1750,7 @@ static char __pyx_k__inp[] = "inp";
 static char __pyx_k__key[] = "key";
 static char __pyx_k__lhs[] = "lhs";
 static char __pyx_k__plf[] = "plf";
+static char __pyx_k__ref[] = "ref";
 static char __pyx_k__BLEU[] = "BLEU";
 static char __pyx_k__eval[] = "eval";
 static char __pyx_k__info[] = "info";
@@ -1612,6 +1768,7 @@ static char __pyx_k__items[] = "items";
 static char __pyx_k__label[] = "label";
 static char __pyx_k__lines[] = "lines";
 static char __pyx_k__range[] = "range";
+static char __pyx_k__rules[] = "rules";
 static char __pyx_k__split[] = "split";
 static char __pyx_k__strip[] = "strip";
 static char __pyx_k__value[] = "value";
@@ -1644,6 +1801,7 @@ static char __pyx_k__enumerate[] = "enumerate";
 static char __pyx_k__evaluator[] = "evaluator";
 static char __pyx_k__formalism[] = "formalism";
 static char __pyx_k__IndexError[] = "IndexError";
+static char __pyx_k__ValueError[] = "ValueError";
 static char __pyx_k__beam_alpha[] = "beam_alpha";
 static char __pyx_k__config_str[] = "config_str";
 static char __pyx_k__hypergraph[] = "hypergraph";
@@ -1657,33 +1815,36 @@ static PyObject *__pyx_kp_s_10;
 static PyObject *__pyx_kp_s_11;
 static PyObject *__pyx_kp_s_12;
 static PyObject *__pyx_kp_s_13;
-static PyObject *__pyx_kp_s_15;
-static PyObject *__pyx_kp_s_18;
+static PyObject *__pyx_n_s_15;
+static PyObject *__pyx_kp_s_16;
+static PyObject *__pyx_kp_s_17;
 static PyObject *__pyx_kp_s_19;
+static PyObject *__pyx_kp_s_22;
 static PyObject *__pyx_kp_s_23;
-static PyObject *__pyx_kp_s_24;
-static PyObject *__pyx_kp_s_25;
-static PyObject *__pyx_kp_s_26;
 static PyObject *__pyx_kp_s_27;
 static PyObject *__pyx_kp_s_28;
+static PyObject *__pyx_kp_s_29;
 static PyObject *__pyx_kp_s_3;
 static PyObject *__pyx_kp_s_30;
 static PyObject *__pyx_kp_s_31;
+static PyObject *__pyx_kp_s_32;
 static PyObject *__pyx_kp_s_34;
 static PyObject *__pyx_kp_s_35;
-static PyObject *__pyx_kp_s_37;
+static PyObject *__pyx_kp_s_38;
 static PyObject *__pyx_kp_s_39;
 static PyObject *__pyx_kp_s_4;
-static PyObject *__pyx_kp_s_40;
-static PyObject *__pyx_kp_s_42;
+static PyObject *__pyx_kp_s_41;
 static PyObject *__pyx_kp_s_43;
 static PyObject *__pyx_kp_s_44;
+static PyObject *__pyx_kp_s_46;
+static PyObject *__pyx_kp_s_47;
 static PyObject *__pyx_kp_s_48;
 static PyObject *__pyx_kp_s_51;
-static PyObject *__pyx_kp_s_56;
-static PyObject *__pyx_n_s_6;
+static PyObject *__pyx_kp_s_54;
+static PyObject *__pyx_kp_s_59;
 static PyObject *__pyx_kp_s_7;
 static PyObject *__pyx_kp_s_8;
+static PyObject *__pyx_kp_s_9;
 static PyObject *__pyx_n_s__BLEU;
 static PyObject *__pyx_n_s__Exception;
 static PyObject *__pyx_n_s__IBM_BLEU;
@@ -1694,6 +1855,7 @@ static PyObject *__pyx_n_s__NotImplemented;
 static PyObject *__pyx_n_s__ParseFailed;
 static PyObject *__pyx_n_s__TER;
 static PyObject *__pyx_n_s__TypeError;
+static PyObject *__pyx_n_s__ValueError;
 static PyObject *__pyx_n_s____enter__;
 static PyObject *__pyx_n_s____exit__;
 static PyObject *__pyx_n_s____main__;
@@ -1701,7 +1863,9 @@ static PyObject *__pyx_n_s____test__;
 static PyObject *__pyx_n_s___cdec;
 static PyObject *__pyx_n_s___make_config;
 static PyObject *__pyx_n_s___phrase;
+static PyObject *__pyx_n_s__a;
 static PyObject *__pyx_n_s__beam_alpha;
+static PyObject *__pyx_n_s__cat;
 static PyObject *__pyx_n_s__config;
 static PyObject *__pyx_n_s__config_str;
 static PyObject *__pyx_n_s__csplit;
@@ -1740,8 +1904,10 @@ static PyObject *__pyx_n_s__pb;
 static PyObject *__pyx_n_s__phrase;
 static PyObject *__pyx_n_s__plf;
 static PyObject *__pyx_n_s__range;
+static PyObject *__pyx_n_s__ref;
 static PyObject *__pyx_n_s__refs;
 static PyObject *__pyx_n_s__replace;
+static PyObject *__pyx_n_s__rules;
 static PyObject *__pyx_n_s__scfg;
 static PyObject *__pyx_n_s__scores;
 static PyObject *__pyx_n_s__self;
@@ -1758,38 +1924,38 @@ static PyObject *__pyx_int_0;
 static PyObject *__pyx_int_1;
 static PyObject *__pyx_k_tuple_2;
 static PyObject *__pyx_k_tuple_5;
-static PyObject *__pyx_k_tuple_9;
+static PyObject *__pyx_k_tuple_6;
 static PyObject *__pyx_k_tuple_14;
-static PyObject *__pyx_k_tuple_16;
-static PyObject *__pyx_k_tuple_17;
+static PyObject *__pyx_k_tuple_18;
 static PyObject *__pyx_k_tuple_20;
 static PyObject *__pyx_k_tuple_21;
-static PyObject *__pyx_k_tuple_22;
-static PyObject *__pyx_k_tuple_29;
-static PyObject *__pyx_k_tuple_32;
+static PyObject *__pyx_k_tuple_24;
+static PyObject *__pyx_k_tuple_25;
+static PyObject *__pyx_k_tuple_26;
+static PyObject *__pyx_k_tuple_33;
 static PyObject *__pyx_k_tuple_36;
-static PyObject *__pyx_k_tuple_38;
-static PyObject *__pyx_k_tuple_41;
+static PyObject *__pyx_k_tuple_40;
+static PyObject *__pyx_k_tuple_42;
 static PyObject *__pyx_k_tuple_45;
-static PyObject *__pyx_k_tuple_46;
-static PyObject *__pyx_k_tuple_47;
 static PyObject *__pyx_k_tuple_49;
+static PyObject *__pyx_k_tuple_50;
 static PyObject *__pyx_k_tuple_52;
-static PyObject *__pyx_k_tuple_53;
-static PyObject *__pyx_k_tuple_54;
-static PyObject *__pyx_k_codeobj_33;
-static PyObject *__pyx_k_codeobj_50;
-static PyObject *__pyx_k_codeobj_55;
+static PyObject *__pyx_k_tuple_55;
+static PyObject *__pyx_k_tuple_56;
+static PyObject *__pyx_k_tuple_57;
+static PyObject *__pyx_k_codeobj_37;
+static PyObject *__pyx_k_codeobj_53;
+static PyObject *__pyx_k_codeobj_58;
 
 /* "_cdec.pyx":6
  * cimport decoder
  * 
- * cdef char* as_str(sentence, error_msg='Cannot convert type %s to str'):             # <<<<<<<<<<<<<<
+ * cdef char* as_str(data, error_msg='Cannot convert type %s to str'):             # <<<<<<<<<<<<<<
  *     cdef bytes ret
- *     if isinstance(sentence, unicode):
+ *     if isinstance(data, unicode):
  */
 
-static char *__pyx_f_5_cdec_as_str(PyObject *__pyx_v_sentence, struct __pyx_opt_args_5_cdec_as_str *__pyx_optional_args) {
+static char *__pyx_f_5_cdec_as_str(PyObject *__pyx_v_data, struct __pyx_opt_args_5_cdec_as_str *__pyx_optional_args) {
   PyObject *__pyx_v_error_msg = ((PyObject *)__pyx_kp_s_1);
   PyObject *__pyx_v_ret = 0;
   char *__pyx_r;
@@ -1809,26 +1975,26 @@ static char *__pyx_f_5_cdec_as_str(PyObject *__pyx_v_sentence, struct __pyx_opt_
   }
 
   /* "_cdec.pyx":8
- * cdef char* as_str(sentence, error_msg='Cannot convert type %s to str'):
+ * cdef char* as_str(data, error_msg='Cannot convert type %s to str'):
  *     cdef bytes ret
- *     if isinstance(sentence, unicode):             # <<<<<<<<<<<<<<
- *         ret = sentence.encode('utf8')
- *     elif isinstance(sentence, str):
+ *     if isinstance(data, unicode):             # <<<<<<<<<<<<<<
+ *         ret = data.encode('utf8')
+ *     elif isinstance(data, str):
  */
   __pyx_t_1 = ((PyObject *)((PyObject*)(&PyUnicode_Type)));
   __Pyx_INCREF(__pyx_t_1);
-  __pyx_t_2 = __Pyx_TypeCheck(__pyx_v_sentence, __pyx_t_1); 
+  __pyx_t_2 = __Pyx_TypeCheck(__pyx_v_data, __pyx_t_1); 
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
   if (__pyx_t_2) {
 
     /* "_cdec.pyx":9
  *     cdef bytes ret
- *     if isinstance(sentence, unicode):
- *         ret = sentence.encode('utf8')             # <<<<<<<<<<<<<<
- *     elif isinstance(sentence, str):
- *         ret = sentence
+ *     if isinstance(data, unicode):
+ *         ret = data.encode('utf8')             # <<<<<<<<<<<<<<
+ *     elif isinstance(data, str):
+ *         ret = data
  */
-    __pyx_t_1 = PyObject_GetAttr(__pyx_v_sentence, __pyx_n_s__encode); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 9; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_1 = PyObject_GetAttr(__pyx_v_data, __pyx_n_s__encode); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 9; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
     __Pyx_GOTREF(__pyx_t_1);
     __pyx_t_3 = PyObject_Call(__pyx_t_1, ((PyObject *)__pyx_k_tuple_2), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 9; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
     __Pyx_GOTREF(__pyx_t_3);
@@ -1840,40 +2006,40 @@ static char *__pyx_f_5_cdec_as_str(PyObject *__pyx_v_sentence, struct __pyx_opt_
   }
 
   /* "_cdec.pyx":10
- *     if isinstance(sentence, unicode):
- *         ret = sentence.encode('utf8')
- *     elif isinstance(sentence, str):             # <<<<<<<<<<<<<<
- *         ret = sentence
+ *     if isinstance(data, unicode):
+ *         ret = data.encode('utf8')
+ *     elif isinstance(data, str):             # <<<<<<<<<<<<<<
+ *         ret = data
  *     else:
  */
   __pyx_t_3 = ((PyObject *)((PyObject*)(&PyString_Type)));
   __Pyx_INCREF(__pyx_t_3);
-  __pyx_t_2 = __Pyx_TypeCheck(__pyx_v_sentence, __pyx_t_3); 
+  __pyx_t_2 = __Pyx_TypeCheck(__pyx_v_data, __pyx_t_3); 
   __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
   if (__pyx_t_2) {
 
     /* "_cdec.pyx":11
- *         ret = sentence.encode('utf8')
- *     elif isinstance(sentence, str):
- *         ret = sentence             # <<<<<<<<<<<<<<
+ *         ret = data.encode('utf8')
+ *     elif isinstance(data, str):
+ *         ret = data             # <<<<<<<<<<<<<<
  *     else:
- *         raise TypeError(error_msg % type(sentence))
+ *         raise TypeError(error_msg % type(data))
  */
-    if (!(likely(PyBytes_CheckExact(__pyx_v_sentence))||((__pyx_v_sentence) == Py_None)||(PyErr_Format(PyExc_TypeError, "Expected bytes, got %.200s", Py_TYPE(__pyx_v_sentence)->tp_name), 0))) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 11; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-    __Pyx_INCREF(__pyx_v_sentence);
-    __pyx_v_ret = ((PyObject*)__pyx_v_sentence);
+    if (!(likely(PyBytes_CheckExact(__pyx_v_data))||((__pyx_v_data) == Py_None)||(PyErr_Format(PyExc_TypeError, "Expected bytes, got %.200s", Py_TYPE(__pyx_v_data)->tp_name), 0))) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 11; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __Pyx_INCREF(__pyx_v_data);
+    __pyx_v_ret = ((PyObject*)__pyx_v_data);
     goto __pyx_L3;
   }
   /*else*/ {
 
     /* "_cdec.pyx":13
- *         ret = sentence
+ *         ret = data
  *     else:
- *         raise TypeError(error_msg % type(sentence))             # <<<<<<<<<<<<<<
+ *         raise TypeError(error_msg % type(data))             # <<<<<<<<<<<<<<
  *     return ret
  * 
  */
-    __pyx_t_3 = PyNumber_Remainder(__pyx_v_error_msg, ((PyObject *)Py_TYPE(__pyx_v_sentence))); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 13; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_3 = PyNumber_Remainder(__pyx_v_error_msg, ((PyObject *)Py_TYPE(__pyx_v_data))); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 13; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
     __Pyx_GOTREF(__pyx_t_3);
     __pyx_t_1 = PyTuple_New(1); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 13; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
     __Pyx_GOTREF(__pyx_t_1);
@@ -1891,7 +2057,7 @@ static char *__pyx_f_5_cdec_as_str(PyObject *__pyx_v_sentence, struct __pyx_opt_
 
   /* "_cdec.pyx":14
  *     else:
- *         raise TypeError(error_msg % type(sentence))
+ *         raise TypeError(error_msg % type(data))
  *     return ret             # <<<<<<<<<<<<<<
  * 
  * include "vectors.pxi"
@@ -2789,7 +2955,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_9__iter__(PyObject *__pyx_v_self
  * 
  *     def __iter__(self):             # <<<<<<<<<<<<<<
  *         cdef FastSparseVector[weight_t].const_iterator* it = new FastSparseVector[weight_t].const_iterator(self.vector[0], False)
- *         try:
+ *         cdef unsigned i
  */
 
 static PyObject *__pyx_pf_5_cdec_12SparseVector_8__iter__(struct __pyx_obj_5_cdec_SparseVector *__pyx_v_self) {
@@ -2833,7 +2999,7 @@ static PyObject *__pyx_gb_5_cdec_12SparseVector_10generator1(__pyx_GeneratorObje
   struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_1___iter__ *)__pyx_generator->closure);
   PyObject *__pyx_r = NULL;
   size_t __pyx_t_1;
-  size_t __pyx_t_2;
+  unsigned int __pyx_t_2;
   PyObject *__pyx_t_3 = NULL;
   PyObject *__pyx_t_4 = NULL;
   PyObject *__pyx_t_5 = NULL;
@@ -2853,22 +3019,22 @@ static PyObject *__pyx_gb_5_cdec_12SparseVector_10generator1(__pyx_GeneratorObje
  * 
  *     def __iter__(self):
  *         cdef FastSparseVector[weight_t].const_iterator* it = new FastSparseVector[weight_t].const_iterator(self.vector[0], False)             # <<<<<<<<<<<<<<
+ *         cdef unsigned i
  *         try:
- *             for i in range(self.vector.size()):
  */
   __pyx_cur_scope->__pyx_v_it = new FastSparseVector<weight_t>::const_iterator((__pyx_cur_scope->__pyx_v_self->vector[0]), 0);
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":57
- *     def __iter__(self):
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":58
  *         cdef FastSparseVector[weight_t].const_iterator* it = new FastSparseVector[weight_t].const_iterator(self.vector[0], False)
+ *         cdef unsigned i
  *         try:             # <<<<<<<<<<<<<<
  *             for i in range(self.vector.size()):
  *                 yield (FDConvert(it[0].ptr().first).c_str(), it[0].ptr().second)
  */
   /*try:*/ {
 
-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":58
- *         cdef FastSparseVector[weight_t].const_iterator* it = new FastSparseVector[weight_t].const_iterator(self.vector[0], False)
+    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":59
+ *         cdef unsigned i
  *         try:
  *             for i in range(self.vector.size()):             # <<<<<<<<<<<<<<
  *                 yield (FDConvert(it[0].ptr().first).c_str(), it[0].ptr().second)
@@ -2878,18 +3044,18 @@ static PyObject *__pyx_gb_5_cdec_12SparseVector_10generator1(__pyx_GeneratorObje
     for (__pyx_t_2 = 0; __pyx_t_2 < __pyx_t_1; __pyx_t_2+=1) {
       __pyx_cur_scope->__pyx_v_i = __pyx_t_2;
 
-      /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":59
+      /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":60
  *         try:
  *             for i in range(self.vector.size()):
  *                 yield (FDConvert(it[0].ptr().first).c_str(), it[0].ptr().second)             # <<<<<<<<<<<<<<
  *                 pinc(it[0]) # ++it
  *         finally:
  */
-      __pyx_t_3 = PyBytes_FromString(FD::Convert((__pyx_cur_scope->__pyx_v_it[0]).operator->()->first).c_str()); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 59; __pyx_clineno = __LINE__; goto __pyx_L5;}
+      __pyx_t_3 = PyBytes_FromString(FD::Convert((__pyx_cur_scope->__pyx_v_it[0]).operator->()->first).c_str()); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 60; __pyx_clineno = __LINE__; goto __pyx_L5;}
       __Pyx_GOTREF(((PyObject *)__pyx_t_3));
-      __pyx_t_4 = PyFloat_FromDouble((__pyx_cur_scope->__pyx_v_it[0]).operator->()->second); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 59; __pyx_clineno = __LINE__; goto __pyx_L5;}
+      __pyx_t_4 = PyFloat_FromDouble((__pyx_cur_scope->__pyx_v_it[0]).operator->()->second); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 60; __pyx_clineno = __LINE__; goto __pyx_L5;}
       __Pyx_GOTREF(__pyx_t_4);
-      __pyx_t_5 = PyTuple_New(2); if (unlikely(!__pyx_t_5)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 59; __pyx_clineno = __LINE__; goto __pyx_L5;}
+      __pyx_t_5 = PyTuple_New(2); if (unlikely(!__pyx_t_5)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 60; __pyx_clineno = __LINE__; goto __pyx_L5;}
       __Pyx_GOTREF(__pyx_t_5);
       PyTuple_SET_ITEM(__pyx_t_5, 0, ((PyObject *)__pyx_t_3));
       __Pyx_GIVEREF(((PyObject *)__pyx_t_3));
@@ -2909,9 +3075,9 @@ static PyObject *__pyx_gb_5_cdec_12SparseVector_10generator1(__pyx_GeneratorObje
       __pyx_L9_resume_from_yield:;
       __pyx_t_1 = __pyx_cur_scope->__pyx_t_0;
       __pyx_t_2 = __pyx_cur_scope->__pyx_t_1;
-      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 59; __pyx_clineno = __LINE__; goto __pyx_L5;}
+      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 60; __pyx_clineno = __LINE__; goto __pyx_L5;}
 
-      /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":60
+      /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":61
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@@ -2922,7 +3088,7 @@ static PyObject *__pyx_gb_5_cdec_12SparseVector_10generator1(__pyx_GeneratorObje
     }
   }
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":62
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":63
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@@ -2982,7 +3148,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_12dot(PyObject *__pyx_v_self, Py
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":64
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":65
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":65
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":66
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":66
+    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":67
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+    __pyx_t_1 = PyFloat_FromDouble(__pyx_v_self->vector->dot((((struct __pyx_obj_5_cdec_DenseVector *)__pyx_v_other)->vector[0]))); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 67; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3030,7 +3196,7 @@ static PyObject *__pyx_pf_5_cdec_12SparseVector_11dot(struct __pyx_obj_5_cdec_Sp
     goto __pyx_L3;
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":67
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":68
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":68
+    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":69
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+    __pyx_t_1 = PyFloat_FromDouble(__pyx_v_self->vector->dot((((struct __pyx_obj_5_cdec_SparseVector *)__pyx_v_other)->vector[0]))); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 69; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3060,26 +3226,26 @@ static PyObject *__pyx_pf_5_cdec_12SparseVector_11dot(struct __pyx_obj_5_cdec_Sp
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":69
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":70
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+  __pyx_t_1 = PyNumber_Remainder(((PyObject *)__pyx_kp_s_3), ((PyObject *)Py_TYPE(__pyx_v_other))); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 70; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __pyx_t_3 = PyTuple_New(1); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 69; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_3 = PyTuple_New(1); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 70; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __pyx_t_1 = PyObject_Call(__pyx_builtin_TypeError, ((PyObject *)__pyx_t_3), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 69; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyObject_Call(__pyx_builtin_TypeError, ((PyObject *)__pyx_t_3), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 70; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  {__pyx_filename = __pyx_f[1]; __pyx_lineno = 69; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  {__pyx_filename = __pyx_f[1]; __pyx_lineno = 70; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
   __pyx_r = Py_None; __Pyx_INCREF(Py_None);
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@@ -3100,8 +3266,8 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_14__richcmp__(PyObject *__pyx_v_
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-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_SparseVector, 1, "y", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 71; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_x), __pyx_ptype_5_cdec_SparseVector, 1, "x", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 72; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_SparseVector, 1, "y", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 72; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3111,7 +3277,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_14__richcmp__(PyObject *__pyx_v_
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":71
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":72
  *         raise TypeError('cannot take the dot product of %s and SparseVector' % type(other))
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":74
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":75
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":72
+    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":73
  * 
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     case 2:
 
-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":73
+    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":74
  *     def __richcmp__(SparseVector x, SparseVector y, int op):
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-    __pyx_t_1 = __Pyx_PyBool_FromLong(((__pyx_v_x->vector[0]) == (__pyx_v_y->vector[0]))); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 73; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_1 = __Pyx_PyBool_FromLong(((__pyx_v_x->vector[0]) == (__pyx_v_y->vector[0]))); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 74; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":74
+    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":75
  *         if op == 2: # ==
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@@ -3171,7 +3337,7 @@ static PyObject *__pyx_pf_5_cdec_12SparseVector_13__richcmp__(struct __pyx_obj_5
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     case 3:
 
-    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":75
+    /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":76
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@@ -3179,11 +3345,11 @@ static PyObject *__pyx_pf_5_cdec_12SparseVector_13__richcmp__(struct __pyx_obj_5
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+    __pyx_t_2 = __Pyx_PyObject_IsTrue(__pyx_t_1); if (unlikely(__pyx_t_2 < 0)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 76; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_1 = __Pyx_PyBool_FromLong((!__pyx_t_2)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 76; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3191,18 +3357,18 @@ static PyObject *__pyx_pf_5_cdec_12SparseVector_13__richcmp__(struct __pyx_obj_5
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":76
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":77
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+  __pyx_t_1 = PyObject_Call(__pyx_builtin_NotImplemented, ((PyObject *)__pyx_k_tuple_5), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  {__pyx_filename = __pyx_f[1]; __pyx_lineno = 76; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  {__pyx_filename = __pyx_f[1]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":78
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":79
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":80
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":81
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":82
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":84
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":85
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+  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_SparseVector)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 86; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":86
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":87
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":87
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":88
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@@ -3365,7 +3531,7 @@ static PyObject *__pyx_pf_5_cdec_12SparseVector_19__neg__(struct __pyx_obj_5_cde
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":88
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":89
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_other), __pyx_ptype_5_cdec_SparseVector, 1, "other", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 91; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3406,7 +3572,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_22__iadd__(PyObject *__pyx_v_sel
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":90
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":91
  *         return result
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  *     def __iadd__(SparseVector self, SparseVector other):             # <<<<<<<<<<<<<<
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":91
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":92
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":93
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_other), __pyx_ptype_5_cdec_SparseVector, 1, "other", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 95; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3463,7 +3629,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_24__isub__(PyObject *__pyx_v_sel
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":94
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":95
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":95
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":96
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":96
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":97
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+    __pyx_v_scalar = __pyx_PyFloat_AsFloat(__pyx_arg_scalar); if (unlikely((__pyx_v_scalar == (float)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 99; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
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@@ -3525,7 +3691,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_26__imul__(PyObject *__pyx_v_sel
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":98
+/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":99
  *         return self
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":99
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":100
  * 
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":100
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":101
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@@ -3589,7 +3755,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_28__idiv__(PyObject *__pyx_v_sel
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":102
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":103
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":104
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":105
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-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_SparseVector, 1, "y", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 106; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_x), __pyx_ptype_5_cdec_SparseVector, 1, "x", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 107; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_SparseVector, 1, "y", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 107; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3649,7 +3815,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_30__add__(PyObject *__pyx_v_x, P
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":106
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":107
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+  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_SparseVector)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 108; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":108
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":109
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":109
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":110
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_SparseVector, 1, "y", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 112; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -3730,7 +3896,7 @@ static PyObject *__pyx_pw_5_cdec_12SparseVector_32__sub__(PyObject *__pyx_v_x, P
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":111
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":112
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+  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_SparseVector)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 113; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":113
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":114
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":114
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":115
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-/* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":116
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":119
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 static void __pyx_pw_5_cdec_10Hypergraph_1__dealloc__(PyObject *__pyx_v_self); /*proto*/
 static void __pyx_pw_5_cdec_10Hypergraph_1__dealloc__(PyObject *__pyx_v_self) {
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+  __pyx_t_1 = PyBytes_FromString(JoshuaVisualizationString((__pyx_v_self->hg[0])).c_str()); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 29; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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 /* Python wrapper */
 static PyObject *__pyx_pw_5_cdec_10Hypergraph_11kbest(PyObject *__pyx_v_self, PyObject *__pyx_v_size); /*proto*/
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 static PyObject *__pyx_pf_5_cdec_10Hypergraph_10kbest(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_size) {
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+      __pyx_t_4 = PyBytes_FromString(TD::GetString(__pyx_cur_scope->__pyx_v_derivation->yield).c_str()); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 39; __pyx_clineno = __LINE__; goto __pyx_L5;}
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-      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 39; __pyx_clineno = __LINE__; goto __pyx_L5;}
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+static PyObject *__pyx_gb_5_cdec_10Hypergraph_15generator5(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
 
 /* Python wrapper */
 static PyObject *__pyx_pw_5_cdec_10Hypergraph_14kbest_trees(PyObject *__pyx_v_self, PyObject *__pyx_v_size); /*proto*/
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 static PyObject *__pyx_pf_5_cdec_10Hypergraph_13kbest_trees(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_size) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees *__pyx_cur_scope;
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+  __pyx_cur_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees *)__pyx_ptype_5_cdec___pyx_scope_struct_9_kbest_trees->tp_new(__pyx_ptype_5_cdec___pyx_scope_struct_9_kbest_trees, __pyx_empty_tuple, NULL);
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-static PyObject *__pyx_gb_5_cdec_10Hypergraph_15generator3(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
+static PyObject *__pyx_gb_5_cdec_10Hypergraph_15generator5(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
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-  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
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+  __pyx_t_1 = __Pyx_PyInt_AsUnsignedInt(__pyx_cur_scope->__pyx_v_size); if (unlikely((__pyx_t_1 == (unsigned int)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 46; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_2 = __Pyx_PyInt_AsLong(__pyx_cur_scope->__pyx_v_size); if (unlikely((__pyx_t_2 == (long)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 50; __pyx_clineno = __LINE__; goto __pyx_L5;}
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+      __pyx_t_7 = PyTuple_New(2); if (unlikely(!__pyx_t_7)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 55; __pyx_clineno = __LINE__; goto __pyx_L5;}
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+      __pyx_t_6 = PyObject_Call(((PyObject *)((PyObject*)(&PyUnicode_Type))), ((PyObject *)__pyx_t_7), NULL); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 55; __pyx_clineno = __LINE__; goto __pyx_L5;}
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+      __pyx_t_6 = PyTuple_New(2); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 56; __pyx_clineno = __LINE__; goto __pyx_L5;}
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-      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 56; __pyx_clineno = __LINE__; goto __pyx_L5;}
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-static PyObject *__pyx_gb_5_cdec_10Hypergraph_18generator4(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
+static PyObject *__pyx_gb_5_cdec_10Hypergraph_18generator6(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
 
 /* Python wrapper */
 static PyObject *__pyx_pw_5_cdec_10Hypergraph_17kbest_features(PyObject *__pyx_v_self, PyObject *__pyx_v_size); /*proto*/
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 static PyObject *__pyx_pf_5_cdec_10Hypergraph_16kbest_features(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, PyObject *__pyx_v_size) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *__pyx_cur_scope;
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+  __pyx_cur_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features *)__pyx_ptype_5_cdec___pyx_scope_struct_10_kbest_features->tp_new(__pyx_ptype_5_cdec___pyx_scope_struct_10_kbest_features, __pyx_empty_tuple, NULL);
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 }
 
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+static PyObject *__pyx_gb_5_cdec_10Hypergraph_18generator6(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
 {
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-  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 61; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 61; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
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+  __pyx_t_1 = __Pyx_PyInt_AsUnsignedInt(__pyx_cur_scope->__pyx_v_size); if (unlikely((__pyx_t_1 == (unsigned int)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 62; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+      __pyx_t_4 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_SparseVector)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 70; __pyx_clineno = __LINE__; goto __pyx_L5;}
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@@ -5114,7 +8515,7 @@ static PyObject *__pyx_gb_5_cdec_10Hypergraph_18generator4(__pyx_GeneratorObject
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-      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 72; __pyx_clineno = __LINE__; goto __pyx_L5;}
+      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 72; __pyx_clineno = __LINE__; goto __pyx_L5;}
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@@ -5163,7 +8564,7 @@ static PyObject *__pyx_gb_5_cdec_10Hypergraph_18generator4(__pyx_GeneratorObject
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-static PyObject *__pyx_gb_5_cdec_10Hypergraph_21generator5(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
+static PyObject *__pyx_gb_5_cdec_10Hypergraph_21generator7(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
 
 /* Python wrapper */
 static PyObject *__pyx_pw_5_cdec_10Hypergraph_20sample(PyObject *__pyx_v_self, PyObject *__pyx_arg_n); /*proto*/
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+    __pyx_v_n = __Pyx_PyInt_AsUnsignedInt(__pyx_arg_n); if (unlikely((__pyx_v_n == (unsigned int)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 76; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
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 static PyObject *__pyx_pf_5_cdec_10Hypergraph_19sample(struct __pyx_obj_5_cdec_Hypergraph *__pyx_v_self, unsigned int __pyx_v_n) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *__pyx_cur_scope;
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+  __pyx_cur_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *)__pyx_ptype_5_cdec___pyx_scope_struct_11_sample->tp_new(__pyx_ptype_5_cdec___pyx_scope_struct_11_sample, __pyx_empty_tuple, NULL);
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+    __pyx_GeneratorObject *gen = __Pyx_Generator_New((__pyx_generator_body_t) __pyx_gb_5_cdec_10Hypergraph_21generator7, (PyObject *) __pyx_cur_scope); if (unlikely(!gen)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 76; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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 }
 
-static PyObject *__pyx_gb_5_cdec_10Hypergraph_21generator5(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
+static PyObject *__pyx_gb_5_cdec_10Hypergraph_21generator7(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
 {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)__pyx_generator->closure);
+  struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *)__pyx_generator->closure);
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-  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 76; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 76; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
   /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":77
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@@ -5319,9 +8720,9 @@ static PyObject *__pyx_gb_5_cdec_10Hypergraph_21generator5(__pyx_GeneratorObject
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+      __pyx_t_4 = PyBytes_FromString(TD::GetString(((__pyx_cur_scope->__pyx_v_hypos[0])[__pyx_cur_scope->__pyx_v_k]).words).c_str()); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 84; __pyx_clineno = __LINE__; goto __pyx_L6;}
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-      __pyx_t_5 = PyTuple_New(2); if (unlikely(!__pyx_t_5)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 84; __pyx_clineno = __LINE__; goto __pyx_L6;}
+      __pyx_t_5 = PyTuple_New(2); if (unlikely(!__pyx_t_5)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 84; __pyx_clineno = __LINE__; goto __pyx_L6;}
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+      __pyx_t_4 = PyObject_Call(((PyObject *)((PyObject*)(&PyUnicode_Type))), ((PyObject *)__pyx_t_5), NULL); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 84; __pyx_clineno = __LINE__; goto __pyx_L6;}
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-      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 84; __pyx_clineno = __LINE__; goto __pyx_L6;}
+      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 84; __pyx_clineno = __LINE__; goto __pyx_L6;}
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@@ -5401,7 +8802,7 @@ static PyObject *__pyx_pw_5_cdec_10Hypergraph_23intersect(PyObject *__pyx_v_self
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_lat), __pyx_ptype_5_cdec_Lattice, 1, "lat", 0))) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 88; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -5436,7 +8837,7 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_22intersect(struct __pyx_obj_5_cde
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+  __pyx_t_1 = __Pyx_PyBool_FromLong(HG::Intersect((__pyx_v_lat->lattice[0]), __pyx_v_self->hg)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 89; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, __pyx_v_kwargs, values, pos_args, "prune") < 0)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 91; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
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-  __Pyx_RaiseArgtupleInvalid("prune", 0, 0, 2, PyTuple_GET_SIZE(__pyx_args)); {__pyx_filename = __pyx_f[2]; __pyx_lineno = 91; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+  __Pyx_RaiseArgtupleInvalid("prune", 0, 0, 2, PyTuple_GET_SIZE(__pyx_args)); {__pyx_filename = __pyx_f[3]; __pyx_lineno = 91; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
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@@ -5557,7 +8958,7 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_24prune(struct __pyx_obj_5_cdec_Hy
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+  __pyx_t_1 = ((PyDict_Contains(((PyObject *)__pyx_v_kwargs), ((PyObject *)__pyx_n_s_15)))); if (unlikely(__pyx_t_1 < 0)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 93; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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     /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":94
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+  __pyx_t_2 = __pyx_PyFloat_AsDouble(__pyx_v_beam_alpha); if (unlikely((__pyx_t_2 == (double)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 96; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_3 = __pyx_PyFloat_AsDouble(__pyx_v_density); if (unlikely((__pyx_t_3 == (double)-1) && PyErr_Occurred())) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 96; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_t_1 = PyBytes_FromString(HypergraphIO::AsPLF((__pyx_v_self->hg[0]), 1).c_str()); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 101; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  if (!(likely(PyString_CheckExact(((PyObject *)__pyx_t_1)))||(PyErr_Format(PyExc_TypeError, "Expected str, got %.200s", Py_TYPE(((PyObject *)__pyx_t_1))->tp_name), 0))) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 101; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -5677,17 +9078,17 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_26lattice(struct __pyx_obj_5_cdec_
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- *     # TODO get feature expectations, get partition function ("inside" score)
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+    __pyx_t_1 = PyObject_Call(__pyx_builtin_TypeError, ((PyObject *)__pyx_t_3), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 110; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    {__pyx_filename = __pyx_f[2]; __pyx_lineno = 110; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    {__pyx_filename = __pyx_f[3]; __pyx_lineno = 110; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -5842,7 +9243,7 @@ static PyObject *__pyx_pf_5_cdec_10Hypergraph_28reweight(struct __pyx_obj_5_cdec
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-static PyObject *__pyx_gb_5_cdec_10Hypergraph_5edges_2generator6(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
+static PyObject *__pyx_gb_5_cdec_10Hypergraph_5edges_2generator8(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
 
 /* Python wrapper */
 static PyObject *__pyx_pw_5_cdec_10Hypergraph_5edges_1__get__(PyObject *__pyx_v_self); /*proto*/
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":115
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-  struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ *__pyx_cur_scope;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_12___get__ *__pyx_cur_scope;
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+  __pyx_cur_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_12___get__ *)__pyx_ptype_5_cdec___pyx_scope_struct_12___get__->tp_new(__pyx_ptype_5_cdec___pyx_scope_struct_12___get__, __pyx_empty_tuple, NULL);
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+    __pyx_GeneratorObject *gen = __Pyx_Generator_New((__pyx_generator_body_t) __pyx_gb_5_cdec_10Hypergraph_5edges_2generator8, (PyObject *) __pyx_cur_scope); if (unlikely(!gen)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 113; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-static PyObject *__pyx_gb_5_cdec_10Hypergraph_5edges_2generator6(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
+static PyObject *__pyx_gb_5_cdec_10Hypergraph_5edges_2generator8(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
 {
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+  struct __pyx_obj_5_cdec___pyx_scope_struct_12___get__ *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_12___get__ *)__pyx_generator->closure);
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-  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 115; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 113; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":117
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":115
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":118
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":116
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+    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_HypergraphEdge)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 116; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_4 = ((struct __pyx_vtabstruct_5_cdec_HypergraphEdge *)((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3)->__pyx_vtab)->init(((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3), __pyx_cur_scope->__pyx_v_self->hg, __pyx_cur_scope->__pyx_v_i); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 116; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 118; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 116; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-static PyObject *__pyx_gb_5_cdec_10Hypergraph_5nodes_2generator7(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
+static PyObject *__pyx_gb_5_cdec_10Hypergraph_5nodes_2generator9(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
 
 /* Python wrapper */
 static PyObject *__pyx_pw_5_cdec_10Hypergraph_5nodes_1__get__(PyObject *__pyx_v_self); /*proto*/
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":121
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-  struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *__pyx_cur_scope;
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+  __pyx_cur_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__ *)__pyx_ptype_5_cdec___pyx_scope_struct_13___get__->tp_new(__pyx_ptype_5_cdec___pyx_scope_struct_13___get__, __pyx_empty_tuple, NULL);
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+    __pyx_GeneratorObject *gen = __Pyx_Generator_New((__pyx_generator_body_t) __pyx_gb_5_cdec_10Hypergraph_5nodes_2generator9, (PyObject *) __pyx_cur_scope); if (unlikely(!gen)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 119; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-static PyObject *__pyx_gb_5_cdec_10Hypergraph_5nodes_2generator7(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
+static PyObject *__pyx_gb_5_cdec_10Hypergraph_5nodes_2generator9(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
 {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *)__pyx_generator->closure);
+  struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__ *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__ *)__pyx_generator->closure);
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-  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 121; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 119; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":123
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":121
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":124
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+    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_HypergraphNode)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 122; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_4 = ((struct __pyx_vtabstruct_5_cdec_HypergraphNode *)((struct __pyx_obj_5_cdec_HypergraphNode *)__pyx_t_3)->__pyx_vtab)->init(((struct __pyx_obj_5_cdec_HypergraphNode *)__pyx_t_3), __pyx_cur_scope->__pyx_v_self->hg, __pyx_cur_scope->__pyx_v_i); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 122; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":128
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+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":170
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+    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_HypergraphNode)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 170; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_4 = ((struct __pyx_vtabstruct_5_cdec_HypergraphNode *)((struct __pyx_obj_5_cdec_HypergraphNode *)__pyx_t_3)->__pyx_vtab)->init(((struct __pyx_obj_5_cdec_HypergraphNode *)__pyx_t_3), __pyx_cur_scope->__pyx_v_self->hg, (__pyx_cur_scope->__pyx_v_self->edge->tail_nodes_[__pyx_cur_scope->__pyx_v_i])); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 170; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -7511,7 +10067,7 @@ static PyObject *__pyx_gb_5_cdec_14HypergraphEdge_10tail_nodes_2generator8(__pyx
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-    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 156; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 170; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -7537,7 +10093,7 @@ static PyObject *__pyx_pw_5_cdec_14HypergraphEdge_4span_1__get__(PyObject *__pyx
   return __pyx_r;
 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":159
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":173
  * 
  *     property span:
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@@ -7556,7 +10112,7 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphEdge_4span___get__(struct __pyx_obj
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":160
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":174
  *     property span:
  *         def __get__(self):
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+  __pyx_t_1 = PyInt_FromLong(__pyx_v_self->edge->i_); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 174; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_t_2 = PyInt_FromLong(__pyx_v_self->edge->j_); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 174; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 160; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 174; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":163
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":177
  * 
  *     property feature_values:
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@@ -7623,19 +10179,19 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphEdge_14feature_values___get__(struc
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":164
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":178
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-  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_SparseVector)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 164; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_SparseVector)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 178; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":165
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":179
  *         def __get__(self):
  *             cdef SparseVector vector = SparseVector()
  *             vector.vector = new FastSparseVector[double](self.edge.feature_values_)             # <<<<<<<<<<<<<<
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":166
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":180
  *             cdef SparseVector vector = SparseVector()
  *             vector.vector = new FastSparseVector[double](self.edge.feature_values_)
  *             return vector             # <<<<<<<<<<<<<<
@@ -7680,7 +10236,7 @@ static PyObject *__pyx_pw_5_cdec_14HypergraphEdge_4prob_1__get__(PyObject *__pyx
   return __pyx_r;
 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":169
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":183
  * 
  *     property prob:
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@@ -7697,7 +10253,7 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphEdge_4prob___get__(struct __pyx_obj
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":170
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":184
  *     property prob:
  *         def __get__(self):
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@@ -7705,7 +10261,7 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphEdge_4prob___get__(struct __pyx_obj
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-  __pyx_t_1 = PyFloat_FromDouble(__pyx_v_self->edge->edge_prob_.as_float()); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 170; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyFloat_FromDouble(__pyx_v_self->edge->edge_prob_.as_float()); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 184; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -7729,8 +10285,8 @@ static PyObject *__pyx_pw_5_cdec_14HypergraphEdge_3__richcmp__(PyObject *__pyx_v
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-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_HypergraphEdge, 1, "y", 0))) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 172; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_x), __pyx_ptype_5_cdec_HypergraphEdge, 1, "x", 0))) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 186; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_HypergraphEdge, 1, "y", 0))) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 186; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -7740,7 +10296,7 @@ static PyObject *__pyx_pw_5_cdec_14HypergraphEdge_3__richcmp__(PyObject *__pyx_v
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":172
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":186
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  *     def __richcmp__(HypergraphEdge x, HypergraphEdge y, int op):             # <<<<<<<<<<<<<<
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":175
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":189
  *         if op == 2: # ==
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@@ -7767,7 +10323,7 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphEdge_2__richcmp__(struct __pyx_obj_
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":173
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":187
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     case 2:
 
-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":174
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":188
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+    __pyx_t_1 = __Pyx_PyBool_FromLong((__pyx_v_x->edge == __pyx_v_y->edge)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 188; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":175
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":189
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":176
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":190
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@@ -7808,11 +10364,11 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphEdge_2__richcmp__(struct __pyx_obj_
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+    __pyx_t_1 = PyObject_RichCompare(((PyObject *)__pyx_v_x), ((PyObject *)__pyx_v_y), Py_EQ); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 190; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_2 = __Pyx_PyObject_IsTrue(__pyx_t_1); if (unlikely(__pyx_t_2 < 0)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 190; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_1 = __Pyx_PyBool_FromLong((!__pyx_t_2)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 190; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -7820,18 +10376,18 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphEdge_2__richcmp__(struct __pyx_obj_
     break;
   }
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":177
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":191
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+  __pyx_t_1 = PyObject_Call(__pyx_builtin_NotImplemented, ((PyObject *)__pyx_k_tuple_18), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 191; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  {__pyx_filename = __pyx_f[2]; __pyx_lineno = 177; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  {__pyx_filename = __pyx_f[3]; __pyx_lineno = 191; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
   __pyx_r = Py_None; __Pyx_INCREF(Py_None);
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@@ -7856,10 +10412,10 @@ static PyObject *__pyx_pw_5_cdec_14HypergraphEdge_5trule_1__get__(PyObject *__py
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":136
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":150
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  *     cdef hypergraph.HypergraphEdge* edge
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+ *     cdef public BaseTRule trule             # <<<<<<<<<<<<<<
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  *     cdef init(self, hypergraph.Hypergraph* hg, unsigned i):
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+  if (!(likely(((__pyx_v_value) == Py_None) || likely(__Pyx_TypeTest(__pyx_v_value, __pyx_ptype_5_cdec_BaseTRule))))) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 150; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __pyx_v_self->trule = ((struct __pyx_obj_5_cdec_TRule *)__pyx_v_value);
+  __pyx_v_self->trule = ((struct __pyx_obj_5_cdec_BaseTRule *)__pyx_v_value);
 
   __pyx_r = 0;
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@@ -7934,14 +10490,14 @@ static int __pyx_pf_5_cdec_14HypergraphEdge_5trule_4__del__(struct __pyx_obj_5_c
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-  __pyx_v_self->trule = ((struct __pyx_obj_5_cdec_TRule *)Py_None);
+  __pyx_v_self->trule = ((struct __pyx_obj_5_cdec_BaseTRule *)Py_None);
 
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-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":183
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":184
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":198
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  */
   __pyx_v_self->hg = __pyx_v_hg;
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":185
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":199
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   __pyx_v_self->node = (&(__pyx_v_hg->nodes_[__pyx_v_i]));
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":186
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":200
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  *         self.node = &hg.nodes_[i]
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 }
-static PyObject *__pyx_gb_5_cdec_14HypergraphNode_8in_edges_2generator9(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
+static PyObject *__pyx_gb_5_cdec_14HypergraphNode_8in_edges_2generator11(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
 
 /* Python wrapper */
 static PyObject *__pyx_pw_5_cdec_14HypergraphNode_8in_edges_1__get__(PyObject *__pyx_v_self); /*proto*/
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":189
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":203
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  *     property in_edges:
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@@ -8012,14 +10568,14 @@ static PyObject *__pyx_pw_5_cdec_14HypergraphNode_8in_edges_1__get__(PyObject *_
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 static PyObject *__pyx_pf_5_cdec_14HypergraphNode_8in_edges___get__(struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_self) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__ *__pyx_cur_scope;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *__pyx_cur_scope;
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+  __pyx_cur_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *)__pyx_ptype_5_cdec___pyx_scope_struct_15___get__->tp_new(__pyx_ptype_5_cdec___pyx_scope_struct_15___get__, __pyx_empty_tuple, NULL);
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+    __pyx_GeneratorObject *gen = __Pyx_Generator_New((__pyx_generator_body_t) __pyx_gb_5_cdec_14HypergraphNode_8in_edges_2generator11, (PyObject *) __pyx_cur_scope); if (unlikely(!gen)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 203; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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 }
 
-static PyObject *__pyx_gb_5_cdec_14HypergraphNode_8in_edges_2generator9(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
+static PyObject *__pyx_gb_5_cdec_14HypergraphNode_8in_edges_2generator11(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
 {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__ *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__ *)__pyx_generator->closure);
+  struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *)__pyx_generator->closure);
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   unsigned int __pyx_t_2;
@@ -8065,9 +10621,9 @@ static PyObject *__pyx_gb_5_cdec_14HypergraphNode_8in_edges_2generator9(__pyx_Ge
     return NULL;
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-  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 189; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 203; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":191
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":205
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":192
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":206
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  *     property out_edges:
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-    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_HypergraphEdge)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 192; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_HypergraphEdge)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 206; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    __pyx_t_4 = ((struct __pyx_vtabstruct_5_cdec_HypergraphEdge *)((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3)->__pyx_vtab)->init(((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3), __pyx_cur_scope->__pyx_v_self->hg, (__pyx_cur_scope->__pyx_v_self->node->in_edges_[__pyx_cur_scope->__pyx_v_i])); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 192; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_4 = ((struct __pyx_vtabstruct_5_cdec_HypergraphEdge *)((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3)->__pyx_vtab)->init(((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3), __pyx_cur_scope->__pyx_v_self->hg, (__pyx_cur_scope->__pyx_v_self->node->in_edges_[__pyx_cur_scope->__pyx_v_i])); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 206; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -8102,7 +10658,7 @@ static PyObject *__pyx_gb_5_cdec_14HypergraphNode_8in_edges_2generator9(__pyx_Ge
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     __pyx_t_1 = __pyx_cur_scope->__pyx_t_0;
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-    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 192; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 206; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-static PyObject *__pyx_gb_5_cdec_14HypergraphNode_9out_edges_2generator10(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
+static PyObject *__pyx_gb_5_cdec_14HypergraphNode_9out_edges_2generator12(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
 
 /* Python wrapper */
 static PyObject *__pyx_pw_5_cdec_14HypergraphNode_9out_edges_1__get__(PyObject *__pyx_v_self); /*proto*/
@@ -8129,7 +10685,7 @@ static PyObject *__pyx_pw_5_cdec_14HypergraphNode_9out_edges_1__get__(PyObject *
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":195
+/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":209
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 static PyObject *__pyx_pf_5_cdec_14HypergraphNode_9out_edges___get__(struct __pyx_obj_5_cdec_HypergraphNode *__pyx_v_self) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_14___get__ *__pyx_cur_scope;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *__pyx_cur_scope;
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   int __pyx_lineno = 0;
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   int __pyx_clineno = 0;
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-  __pyx_cur_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_14___get__ *)__pyx_ptype_5_cdec___pyx_scope_struct_14___get__->tp_new(__pyx_ptype_5_cdec___pyx_scope_struct_14___get__, __pyx_empty_tuple, NULL);
+  __pyx_cur_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *)__pyx_ptype_5_cdec___pyx_scope_struct_16___get__->tp_new(__pyx_ptype_5_cdec___pyx_scope_struct_16___get__, __pyx_empty_tuple, NULL);
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@@ -8155,7 +10711,7 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphNode_9out_edges___get__(struct __py
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   __Pyx_GIVEREF((PyObject *)__pyx_cur_scope->__pyx_v_self);
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-    __pyx_GeneratorObject *gen = __Pyx_Generator_New((__pyx_generator_body_t) __pyx_gb_5_cdec_14HypergraphNode_9out_edges_2generator10, (PyObject *) __pyx_cur_scope); if (unlikely(!gen)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 195; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_GeneratorObject *gen = __Pyx_Generator_New((__pyx_generator_body_t) __pyx_gb_5_cdec_14HypergraphNode_9out_edges_2generator12, (PyObject *) __pyx_cur_scope); if (unlikely(!gen)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 209; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -8173,9 +10729,9 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphNode_9out_edges___get__(struct __py
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 }
 
-static PyObject *__pyx_gb_5_cdec_14HypergraphNode_9out_edges_2generator10(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
+static PyObject *__pyx_gb_5_cdec_14HypergraphNode_9out_edges_2generator12(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
 {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_14___get__ *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_14___get__ *)__pyx_generator->closure);
+  struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *)__pyx_generator->closure);
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   unsigned int __pyx_t_2;
@@ -8191,9 +10747,9 @@ static PyObject *__pyx_gb_5_cdec_14HypergraphNode_9out_edges_2generator10(__pyx_
     return NULL;
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-  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 195; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 209; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":197
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":211
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@@ -8204,16 +10760,16 @@ static PyObject *__pyx_gb_5_cdec_14HypergraphNode_9out_edges_2generator10(__pyx_
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":198
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":212
  *             cdef unsigned i
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  *     property span:
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-    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_HypergraphEdge)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 198; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_3 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_HypergraphEdge)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 212; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    __pyx_t_4 = ((struct __pyx_vtabstruct_5_cdec_HypergraphEdge *)((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3)->__pyx_vtab)->init(((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3), __pyx_cur_scope->__pyx_v_self->hg, (__pyx_cur_scope->__pyx_v_self->node->out_edges_[__pyx_cur_scope->__pyx_v_i])); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 198; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_4 = ((struct __pyx_vtabstruct_5_cdec_HypergraphEdge *)((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3)->__pyx_vtab)->init(((struct __pyx_obj_5_cdec_HypergraphEdge *)__pyx_t_3), __pyx_cur_scope->__pyx_v_self->hg, (__pyx_cur_scope->__pyx_v_self->node->out_edges_[__pyx_cur_scope->__pyx_v_i])); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 212; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -8228,7 +10784,7 @@ static PyObject *__pyx_gb_5_cdec_14HypergraphNode_9out_edges_2generator10(__pyx_
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     __pyx_t_1 = __pyx_cur_scope->__pyx_t_0;
     __pyx_t_2 = __pyx_cur_scope->__pyx_t_1;
-    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 198; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 212; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":201
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":202
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+  __pyx_t_1 = PyObject_GetAttr(((PyObject *)__pyx_v_self), __pyx_n_s__in_edges); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 216; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(__pyx_t_1);
-  __pyx_t_2 = __Pyx_PyIter_Next(__pyx_t_1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 202; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_2 = __Pyx_PyIter_Next(__pyx_t_1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 216; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(__pyx_t_2);
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
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+  __pyx_t_1 = PyObject_GetAttr(__pyx_t_2, __pyx_n_s__span); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 216; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":205
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":206
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":207
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":221
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+    __pyx_t_1 = PyBytes_FromString(TD::Convert((-__pyx_v_self->node->cat_))); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 221; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_x), __pyx_ptype_5_cdec_HypergraphNode, 1, "x", 0))) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 223; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y), __pyx_ptype_5_cdec_HypergraphNode, 1, "y", 0))) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 223; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -8388,7 +10944,7 @@ static PyObject *__pyx_pw_5_cdec_14HypergraphNode_1__richcmp__(PyObject *__pyx_v
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 }
 
-/* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":209
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":212
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":226
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":210
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":224
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":211
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":225
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+    __pyx_t_1 = __Pyx_PyBool_FromLong((__pyx_v_x->node == __pyx_v_y->node)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 225; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":212
+    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":226
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-    /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":213
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+    __pyx_t_2 = __Pyx_PyObject_IsTrue(__pyx_t_1); if (unlikely(__pyx_t_2 < 0)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 227; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_1 = __Pyx_PyBool_FromLong((!__pyx_t_2)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 227; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -8467,16 +11023,16 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphNode___richcmp__(struct __pyx_obj_5
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":214
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":228
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-  __pyx_t_1 = PyObject_Call(__pyx_builtin_NotImplemented, ((PyObject *)__pyx_k_tuple_16), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 214; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyObject_Call(__pyx_builtin_NotImplemented, ((PyObject *)__pyx_k_tuple_20), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 228; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  {__pyx_filename = __pyx_f[2]; __pyx_lineno = 214; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  {__pyx_filename = __pyx_f[3]; __pyx_lineno = 228; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
   __pyx_r = Py_None; __Pyx_INCREF(Py_None);
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@@ -8491,13 +11047,13 @@ static PyObject *__pyx_pf_5_cdec_14HypergraphNode___richcmp__(struct __pyx_obj_5
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 /* Python wrapper */
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-static int __pyx_pw_5_cdec_7Lattice_1__init__(PyObject *__pyx_v_self, PyObject *__pyx_args, PyObject *__pyx_kwds) {
+static int __pyx_pw_5_cdec_7Lattice_1__cinit__(PyObject *__pyx_v_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
+static int __pyx_pw_5_cdec_7Lattice_1__cinit__(PyObject *__pyx_v_self, PyObject *__pyx_args, PyObject *__pyx_kwds) {
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+  __Pyx_RaiseArgtupleInvalid("__cinit__", 1, 1, 1, PyTuple_GET_SIZE(__pyx_args)); {__pyx_filename = __pyx_f[4]; __pyx_lineno = 6; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
   __pyx_L3_error:;
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- *     def __init__(self, inp):             # <<<<<<<<<<<<<<
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-static int __pyx_pf_5_cdec_7Lattice___init__(struct __pyx_obj_5_cdec_Lattice *__pyx_v_self, PyObject *__pyx_v_inp) {
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- *     def __init__(self, inp):
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     /* "/Users/vchahun/Sandbox/cdec/python/src/lattice.pxi":8
- *     def __init__(self, inp):
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+    __pyx_t_3 = PyObject_Length(__pyx_v_inp); if (unlikely(__pyx_t_3 == -1)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 8; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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 /* Python wrapper */
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@@ -12161,7 +14717,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
       __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
     } else {
       Py_ssize_t index = -1;
-      __pyx_t_7 = PyObject_GetIter(__pyx_t_2); if (unlikely(!__pyx_t_7)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 28; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __pyx_t_7 = PyObject_GetIter(__pyx_t_2); if (unlikely(!__pyx_t_7)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 29; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       __Pyx_GOTREF(__pyx_t_7);
       __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
       __pyx_t_8 = Py_TYPE(__pyx_t_7)->tp_iternext;
@@ -12169,14 +14725,14 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
       __Pyx_GOTREF(__pyx_t_5);
       index = 1; __pyx_t_6 = __pyx_t_8(__pyx_t_7); if (unlikely(!__pyx_t_6)) goto __pyx_L6_unpacking_failed;
       __Pyx_GOTREF(__pyx_t_6);
-      if (__Pyx_IternextUnpackEndCheck(__pyx_t_8(__pyx_t_7), 2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 28; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      if (__Pyx_IternextUnpackEndCheck(__pyx_t_8(__pyx_t_7), 2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 29; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       __Pyx_DECREF(__pyx_t_7); __pyx_t_7 = 0;
       goto __pyx_L7_unpacking_done;
       __pyx_L6_unpacking_failed:;
       __Pyx_DECREF(__pyx_t_7); __pyx_t_7 = 0;
       if (PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_StopIteration)) PyErr_Clear();
       if (!PyErr_Occurred()) __Pyx_RaiseNeedMoreValuesError(index);
-      {__pyx_filename = __pyx_f[0]; __pyx_lineno = 28; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      {__pyx_filename = __pyx_f[0]; __pyx_lineno = 29; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       __pyx_L7_unpacking_done:;
     }
     __Pyx_XGOTREF(__pyx_cur_scope->__pyx_v_key);
@@ -12190,7 +14746,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
     __pyx_cur_scope->__pyx_v_value = __pyx_t_6;
     __pyx_t_6 = 0;
 
-    /* "_cdec.pyx":29
+    /* "_cdec.pyx":30
  * def _make_config(config):
  *     for key, value in config.items():
  *         if isinstance(value, dict):             # <<<<<<<<<<<<<<
@@ -12203,23 +14759,23 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
     if (__pyx_t_9) {
 
-      /* "_cdec.pyx":30
+      /* "_cdec.pyx":31
  *     for key, value in config.items():
  *         if isinstance(value, dict):
  *             for name, info in value.items():             # <<<<<<<<<<<<<<
  *                 yield key, '%s %s' % (name, info)
  *         elif isinstance(value, list):
  */
-      __pyx_t_2 = PyObject_GetAttr(__pyx_cur_scope->__pyx_v_value, __pyx_n_s__items); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __pyx_t_2 = PyObject_GetAttr(__pyx_cur_scope->__pyx_v_value, __pyx_n_s__items); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       __Pyx_GOTREF(__pyx_t_2);
-      __pyx_t_6 = PyObject_Call(__pyx_t_2, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __pyx_t_6 = PyObject_Call(__pyx_t_2, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       __Pyx_GOTREF(__pyx_t_6);
       __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
       if (PyList_CheckExact(__pyx_t_6) || PyTuple_CheckExact(__pyx_t_6)) {
         __pyx_t_2 = __pyx_t_6; __Pyx_INCREF(__pyx_t_2); __pyx_t_10 = 0;
         __pyx_t_11 = NULL;
       } else {
-        __pyx_t_10 = -1; __pyx_t_2 = PyObject_GetIter(__pyx_t_6); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        __pyx_t_10 = -1; __pyx_t_2 = PyObject_GetIter(__pyx_t_6); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
         __Pyx_GOTREF(__pyx_t_2);
         __pyx_t_11 = Py_TYPE(__pyx_t_2)->tp_iternext;
       }
@@ -12236,7 +14792,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
           if (unlikely(!__pyx_t_6)) {
             if (PyErr_Occurred()) {
               if (likely(PyErr_ExceptionMatches(PyExc_StopIteration))) PyErr_Clear();
-              else {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+              else {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
             }
             break;
           }
@@ -12248,7 +14804,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
             if (unlikely(PyTuple_GET_SIZE(sequence) != 2)) {
               if (PyTuple_GET_SIZE(sequence) > 2) __Pyx_RaiseTooManyValuesError(2);
               else __Pyx_RaiseNeedMoreValuesError(PyTuple_GET_SIZE(sequence));
-              {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+              {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
             }
             __pyx_t_5 = PyTuple_GET_ITEM(sequence, 0); 
             __pyx_t_7 = PyTuple_GET_ITEM(sequence, 1); 
@@ -12256,7 +14812,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
             if (unlikely(PyList_GET_SIZE(sequence) != 2)) {
               if (PyList_GET_SIZE(sequence) > 2) __Pyx_RaiseTooManyValuesError(2);
               else __Pyx_RaiseNeedMoreValuesError(PyList_GET_SIZE(sequence));
-              {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+              {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
             }
             __pyx_t_5 = PyList_GET_ITEM(sequence, 0); 
             __pyx_t_7 = PyList_GET_ITEM(sequence, 1); 
@@ -12266,7 +14822,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
           __Pyx_DECREF(__pyx_t_6); __pyx_t_6 = 0;
         } else {
           Py_ssize_t index = -1;
-          __pyx_t_12 = PyObject_GetIter(__pyx_t_6); if (unlikely(!__pyx_t_12)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+          __pyx_t_12 = PyObject_GetIter(__pyx_t_6); if (unlikely(!__pyx_t_12)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
           __Pyx_GOTREF(__pyx_t_12);
           __Pyx_DECREF(__pyx_t_6); __pyx_t_6 = 0;
           __pyx_t_8 = Py_TYPE(__pyx_t_12)->tp_iternext;
@@ -12274,14 +14830,14 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
           __Pyx_GOTREF(__pyx_t_5);
           index = 1; __pyx_t_7 = __pyx_t_8(__pyx_t_12); if (unlikely(!__pyx_t_7)) goto __pyx_L11_unpacking_failed;
           __Pyx_GOTREF(__pyx_t_7);
-          if (__Pyx_IternextUnpackEndCheck(__pyx_t_8(__pyx_t_12), 2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+          if (__Pyx_IternextUnpackEndCheck(__pyx_t_8(__pyx_t_12), 2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
           __Pyx_DECREF(__pyx_t_12); __pyx_t_12 = 0;
           goto __pyx_L12_unpacking_done;
           __pyx_L11_unpacking_failed:;
           __Pyx_DECREF(__pyx_t_12); __pyx_t_12 = 0;
           if (PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_StopIteration)) PyErr_Clear();
           if (!PyErr_Occurred()) __Pyx_RaiseNeedMoreValuesError(index);
-          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
           __pyx_L12_unpacking_done:;
         }
         __Pyx_XGOTREF(__pyx_cur_scope->__pyx_v_name);
@@ -12295,14 +14851,14 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
         __pyx_cur_scope->__pyx_v_info = __pyx_t_7;
         __pyx_t_7 = 0;
 
-        /* "_cdec.pyx":31
+        /* "_cdec.pyx":32
  *         if isinstance(value, dict):
  *             for name, info in value.items():
  *                 yield key, '%s %s' % (name, info)             # <<<<<<<<<<<<<<
  *         elif isinstance(value, list):
  *             for name in value:
  */
-        __pyx_t_6 = PyTuple_New(2); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        __pyx_t_6 = PyTuple_New(2); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
         __Pyx_GOTREF(__pyx_t_6);
         __Pyx_INCREF(__pyx_cur_scope->__pyx_v_name);
         PyTuple_SET_ITEM(__pyx_t_6, 0, __pyx_cur_scope->__pyx_v_name);
@@ -12310,10 +14866,10 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
         __Pyx_INCREF(__pyx_cur_scope->__pyx_v_info);
         PyTuple_SET_ITEM(__pyx_t_6, 1, __pyx_cur_scope->__pyx_v_info);
         __Pyx_GIVEREF(__pyx_cur_scope->__pyx_v_info);
-        __pyx_t_7 = PyNumber_Remainder(((PyObject *)__pyx_kp_s_39), ((PyObject *)__pyx_t_6)); if (unlikely(!__pyx_t_7)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        __pyx_t_7 = PyNumber_Remainder(((PyObject *)__pyx_kp_s_43), ((PyObject *)__pyx_t_6)); if (unlikely(!__pyx_t_7)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
         __Pyx_GOTREF(((PyObject *)__pyx_t_7));
         __Pyx_DECREF(((PyObject *)__pyx_t_6)); __pyx_t_6 = 0;
-        __pyx_t_6 = PyTuple_New(2); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        __pyx_t_6 = PyTuple_New(2); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
         __Pyx_GOTREF(__pyx_t_6);
         __Pyx_INCREF(__pyx_cur_scope->__pyx_v_key);
         PyTuple_SET_ITEM(__pyx_t_6, 0, __pyx_cur_scope->__pyx_v_key);
@@ -12347,13 +14903,13 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
         __pyx_t_4 = __pyx_cur_scope->__pyx_t_3;
         __pyx_t_10 = __pyx_cur_scope->__pyx_t_4;
         __pyx_t_11 = __pyx_cur_scope->__pyx_t_5;
-        if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       }
       __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
       goto __pyx_L8;
     }
 
-    /* "_cdec.pyx":32
+    /* "_cdec.pyx":33
  *             for name, info in value.items():
  *                 yield key, '%s %s' % (name, info)
  *         elif isinstance(value, list):             # <<<<<<<<<<<<<<
@@ -12366,7 +14922,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
     if (__pyx_t_9) {
 
-      /* "_cdec.pyx":33
+      /* "_cdec.pyx":34
  *                 yield key, '%s %s' % (name, info)
  *         elif isinstance(value, list):
  *             for name in value:             # <<<<<<<<<<<<<<
@@ -12377,7 +14933,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
         __pyx_t_2 = __pyx_cur_scope->__pyx_v_value; __Pyx_INCREF(__pyx_t_2); __pyx_t_10 = 0;
         __pyx_t_11 = NULL;
       } else {
-        __pyx_t_10 = -1; __pyx_t_2 = PyObject_GetIter(__pyx_cur_scope->__pyx_v_value); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 33; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        __pyx_t_10 = -1; __pyx_t_2 = PyObject_GetIter(__pyx_cur_scope->__pyx_v_value); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
         __Pyx_GOTREF(__pyx_t_2);
         __pyx_t_11 = Py_TYPE(__pyx_t_2)->tp_iternext;
       }
@@ -12393,7 +14949,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
           if (unlikely(!__pyx_t_6)) {
             if (PyErr_Occurred()) {
               if (likely(PyErr_ExceptionMatches(PyExc_StopIteration))) PyErr_Clear();
-              else {__pyx_filename = __pyx_f[0]; __pyx_lineno = 33; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+              else {__pyx_filename = __pyx_f[0]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
             }
             break;
           }
@@ -12405,14 +14961,14 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
         __pyx_cur_scope->__pyx_v_name = __pyx_t_6;
         __pyx_t_6 = 0;
 
-        /* "_cdec.pyx":34
+        /* "_cdec.pyx":35
  *         elif isinstance(value, list):
  *             for name in value:
  *                 yield key, name             # <<<<<<<<<<<<<<
  *         else:
  *             yield key, bytes(value)
  */
-        __pyx_t_6 = PyTuple_New(2); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        __pyx_t_6 = PyTuple_New(2); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 35; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
         __Pyx_GOTREF(__pyx_t_6);
         __Pyx_INCREF(__pyx_cur_scope->__pyx_v_key);
         PyTuple_SET_ITEM(__pyx_t_6, 0, __pyx_cur_scope->__pyx_v_key);
@@ -12446,29 +15002,29 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
         __pyx_t_4 = __pyx_cur_scope->__pyx_t_3;
         __pyx_t_10 = __pyx_cur_scope->__pyx_t_4;
         __pyx_t_11 = __pyx_cur_scope->__pyx_t_5;
-        if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 35; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       }
       __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
       goto __pyx_L8;
     }
     /*else*/ {
 
-      /* "_cdec.pyx":36
+      /* "_cdec.pyx":37
  *                 yield key, name
  *         else:
  *             yield key, bytes(value)             # <<<<<<<<<<<<<<
  * 
  * cdef class Decoder:
  */
-      __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 37; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       __Pyx_GOTREF(__pyx_t_2);
       __Pyx_INCREF(__pyx_cur_scope->__pyx_v_value);
       PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_cur_scope->__pyx_v_value);
       __Pyx_GIVEREF(__pyx_cur_scope->__pyx_v_value);
-      __pyx_t_6 = PyObject_Call(((PyObject *)((PyObject*)(&PyBytes_Type))), ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __pyx_t_6 = PyObject_Call(((PyObject *)((PyObject*)(&PyBytes_Type))), ((PyObject *)__pyx_t_2), NULL); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 37; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       __Pyx_GOTREF(__pyx_t_6);
       __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
-      __pyx_t_2 = PyTuple_New(2); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __pyx_t_2 = PyTuple_New(2); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 37; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       __Pyx_GOTREF(__pyx_t_2);
       __Pyx_INCREF(__pyx_cur_scope->__pyx_v_key);
       PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_cur_scope->__pyx_v_key);
@@ -12493,7 +15049,7 @@ static PyObject *__pyx_gb_5_cdec_4generator14(__pyx_GeneratorObject *__pyx_gener
       __Pyx_XGOTREF(__pyx_t_1);
       __pyx_t_3 = __pyx_cur_scope->__pyx_t_2;
       __pyx_t_4 = __pyx_cur_scope->__pyx_t_3;
-      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 37; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
     }
     __pyx_L8:;
   }
@@ -12529,7 +15085,7 @@ static int __pyx_pw_5_cdec_7Decoder_1__cinit__(PyObject *__pyx_v_self, PyObject
   {
     PyObject* values[1] = {0};
 
-    /* "_cdec.pyx":42
+    /* "_cdec.pyx":43
  *     cdef DenseVector weights
  * 
  *     def __cinit__(self, config_str=None, **config):             # <<<<<<<<<<<<<<
@@ -12554,7 +15110,7 @@ static int __pyx_pw_5_cdec_7Decoder_1__cinit__(PyObject *__pyx_v_self, PyObject
         }
       }
       if (unlikely(kw_args > 0)) {
-        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, __pyx_v_config, values, pos_args, "__cinit__") < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 42; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, __pyx_v_config, values, pos_args, "__cinit__") < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
       }
     } else {
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@@ -12567,7 +15123,7 @@ static int __pyx_pw_5_cdec_7Decoder_1__cinit__(PyObject *__pyx_v_self, PyObject
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+  __Pyx_RaiseArgtupleInvalid("__cinit__", 0, 0, 1, PyTuple_GET_SIZE(__pyx_args)); {__pyx_filename = __pyx_f[0]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
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-static PyObject *__pyx_gb_5_cdec_7Decoder_9__cinit___2generator18(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
+static PyObject *__pyx_gb_5_cdec_7Decoder_9__cinit___2generator20(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value); /* proto */
 
-/* "_cdec.pyx":53
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-  struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr *__pyx_cur_scope;
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-  __pyx_cur_scope->__pyx_outer_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *) __pyx_self;
+  __pyx_cur_scope->__pyx_outer_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *) __pyx_self;
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-static PyObject *__pyx_gb_5_cdec_7Decoder_9__cinit___2generator18(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
+static PyObject *__pyx_gb_5_cdec_7Decoder_9__cinit___2generator20(__pyx_GeneratorObject *__pyx_generator, PyObject *__pyx_sent_value) /* generator body */
 {
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+  struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *__pyx_cur_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *)__pyx_generator->closure);
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+  if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_3 = PyNumber_Remainder(((PyObject *)__pyx_kp_s_44), __pyx_cur_scope->__pyx_v_kv); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    if (unlikely(!__pyx_sent_value)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-/* "_cdec.pyx":42
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-  struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *__pyx_cur_scope;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *__pyx_cur_scope;
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   std::istringstream *__pyx_v_config_stream;
   int __pyx_r;
@@ -12750,7 +15306,7 @@ static int __pyx_pf_5_cdec_7Decoder___cinit__(struct __pyx_obj_5_cdec_Decoder *_
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+  __pyx_cur_scope = (struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *)__pyx_ptype_5_cdec___pyx_scope_struct_23___cinit__->tp_new(__pyx_ptype_5_cdec___pyx_scope_struct_23___cinit__, __pyx_empty_tuple, NULL);
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@@ -12761,7 +15317,7 @@ static int __pyx_pf_5_cdec_7Decoder___cinit__(struct __pyx_obj_5_cdec_Decoder *_
   __Pyx_GIVEREF(__pyx_cur_scope->__pyx_v_config);
   __Pyx_INCREF(__pyx_v_config_str);
 
-  /* "_cdec.pyx":48
+  /* "_cdec.pyx":49
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-    /* "_cdec.pyx":49
+    /* "_cdec.pyx":50
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+    __pyx_t_2 = PyObject_GetAttr(__pyx_cur_scope->__pyx_v_config, __pyx_n_s__get); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 50; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    /* "_cdec.pyx":50
+    /* "_cdec.pyx":51
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+      __pyx_t_3 = __Pyx_GetName(__pyx_m, __pyx_n_s__InvalidConfig); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+      __pyx_t_2 = PyNumber_Remainder(((PyObject *)__pyx_kp_s_46), __pyx_v_formalism); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+      __pyx_t_6 = PyTuple_New(1); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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       PyTuple_SET_ITEM(__pyx_t_6, 0, ((PyObject *)__pyx_t_2));
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+      __pyx_t_2 = PyObject_Call(__pyx_t_3, ((PyObject *)__pyx_t_6), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-      {__pyx_filename = __pyx_f[0]; __pyx_lineno = 52; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
       goto __pyx_L4;
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     __pyx_L4:;
 
-    /* "_cdec.pyx":53
+    /* "_cdec.pyx":54
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+    __pyx_t_2 = PyObject_GetAttr(((PyObject *)__pyx_kp_s_39), __pyx_n_s__join); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_6 = __pyx_pf_5_cdec_7Decoder_9__cinit___genexpr(((PyObject*)__pyx_cur_scope)); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    __pyx_t_3 = PyTuple_New(1); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_3 = PyTuple_New(1); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    __pyx_t_6 = PyObject_Call(__pyx_t_2, ((PyObject *)__pyx_t_3), NULL); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_6 = PyObject_Call(__pyx_t_2, ((PyObject *)__pyx_t_3), NULL); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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     __Pyx_DECREF(((PyObject *)__pyx_t_3)); __pyx_t_3 = 0;
@@ -12890,17 +15446,17 @@ static int __pyx_pf_5_cdec_7Decoder___cinit__(struct __pyx_obj_5_cdec_Decoder *_
   }
   __pyx_L3:;
 
-  /* "_cdec.pyx":54
+  /* "_cdec.pyx":55
  *                 raise InvalidConfig('formalism "%s" unknown' % formalism)
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  *         self.dec = new decoder.Decoder(config_stream)
  *         del config_stream
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-  __pyx_t_7 = PyBytes_AsString(__pyx_v_config_str); if (unlikely((!__pyx_t_7) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_7 = PyBytes_AsString(__pyx_v_config_str); if (unlikely((!__pyx_t_7) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 55; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "_cdec.pyx":55
+  /* "_cdec.pyx":56
  *             config_str = '\n'.join('%s = %s' % kv for kv in _make_config(config))
  *         cdef istringstream* config_stream = new istringstream(config_str)
  *         self.dec = new decoder.Decoder(config_stream)             # <<<<<<<<<<<<<<
@@ -12909,7 +15465,7 @@ static int __pyx_pf_5_cdec_7Decoder___cinit__(struct __pyx_obj_5_cdec_Decoder *_
  */
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-  /* "_cdec.pyx":56
+  /* "_cdec.pyx":57
  *         cdef istringstream* config_stream = new istringstream(config_str)
  *         self.dec = new decoder.Decoder(config_stream)
  *         del config_stream             # <<<<<<<<<<<<<<
@@ -12918,14 +15474,14 @@ static int __pyx_pf_5_cdec_7Decoder___cinit__(struct __pyx_obj_5_cdec_Decoder *_
  */
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-  /* "_cdec.pyx":57
+  /* "_cdec.pyx":58
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  *         del config_stream
  *         self.weights = DenseVector()             # <<<<<<<<<<<<<<
  *         self.weights.vector = &self.dec.CurrentWeightVector()
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+  __pyx_t_6 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_DenseVector)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_6)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 58; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  /* "_cdec.pyx":58
+  /* "_cdec.pyx":59
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  *         self.weights.vector = &self.dec.CurrentWeightVector()             # <<<<<<<<<<<<<<
@@ -12967,7 +15523,7 @@ static void __pyx_pw_5_cdec_7Decoder_3__dealloc__(PyObject *__pyx_v_self) {
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-/* "_cdec.pyx":60
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-  /* "_cdec.pyx":61
+  /* "_cdec.pyx":62
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  *     def __dealloc__(self):
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@@ -13002,7 +15558,7 @@ static PyObject *__pyx_pw_5_cdec_7Decoder_7weights_1__get__(PyObject *__pyx_v_se
   return __pyx_r;
 }
 
-/* "_cdec.pyx":64
+/* "_cdec.pyx":65
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  *     property weights:
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-  /* "_cdec.pyx":65
+  /* "_cdec.pyx":66
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@@ -13045,7 +15601,7 @@ static int __pyx_pw_5_cdec_7Decoder_7weights_3__set__(PyObject *__pyx_v_self, Py
   return __pyx_r;
 }
 
-/* "_cdec.pyx":67
+/* "_cdec.pyx":68
  *             return self.weights
  * 
  *         def __set__(self, weights):             # <<<<<<<<<<<<<<
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-  /* "_cdec.pyx":68
+  /* "_cdec.pyx":69
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  *         def __set__(self, weights):
  *             if isinstance(weights, DenseVector):             # <<<<<<<<<<<<<<
@@ -13085,7 +15641,7 @@ static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_De
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
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-    /* "_cdec.pyx":69
+    /* "_cdec.pyx":70
  *         def __set__(self, weights):
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  *                 self.weights.vector[0] = (<DenseVector> weights).vector[0]             # <<<<<<<<<<<<<<
@@ -13096,7 +15652,7 @@ static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_De
     goto __pyx_L3;
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-  /* "_cdec.pyx":70
+  /* "_cdec.pyx":71
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-    /* "_cdec.pyx":71
+    /* "_cdec.pyx":72
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-    /* "_cdec.pyx":72
+    /* "_cdec.pyx":73
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-  /* "_cdec.pyx":73
+  /* "_cdec.pyx":74
  *                 self.weights.vector.clear()
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-    /* "_cdec.pyx":74
+    /* "_cdec.pyx":75
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  *                     self.weights[fname] = fval
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+    __pyx_t_1 = PyObject_GetAttr(__pyx_v_weights, __pyx_n_s__items); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+    __pyx_t_3 = PyObject_Call(__pyx_t_1, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+      __pyx_t_4 = -1; __pyx_t_1 = PyObject_GetIter(__pyx_t_3); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -13175,7 +15731,7 @@ static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_De
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-            else {__pyx_filename = __pyx_f[0]; __pyx_lineno = 74; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+            else {__pyx_filename = __pyx_f[0]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -13187,7 +15743,7 @@ static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_De
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-            {__pyx_filename = __pyx_f[0]; __pyx_lineno = 74; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+            {__pyx_filename = __pyx_f[0]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -13195,7 +15751,7 @@ static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_De
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-            {__pyx_filename = __pyx_f[0]; __pyx_lineno = 74; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+            {__pyx_filename = __pyx_f[0]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -13205,7 +15761,7 @@ static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_De
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+        __pyx_t_8 = PyObject_GetIter(__pyx_t_3); if (unlikely(!__pyx_t_8)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -13213,14 +15769,14 @@ static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_De
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+        if (__Pyx_IternextUnpackEndCheck(__pyx_t_9(__pyx_t_8), 2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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         if (!PyErr_Occurred()) __Pyx_RaiseNeedMoreValuesError(index);
-        {__pyx_filename = __pyx_f[0]; __pyx_lineno = 74; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        {__pyx_filename = __pyx_f[0]; __pyx_lineno = 75; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -13230,40 +15786,40 @@ static int __pyx_pf_5_cdec_7Decoder_7weights_2__set__(struct __pyx_obj_5_cdec_De
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-      /* "_cdec.pyx":75
+      /* "_cdec.pyx":76
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+    __pyx_t_1 = PyObject_Call(__pyx_builtin_TypeError, ((PyObject *)__pyx_t_3), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 78; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -13295,7 +15851,7 @@ static PyObject *__pyx_pw_5_cdec_7Decoder_9formalism_1__get__(PyObject *__pyx_v_
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 }
 
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-  /* "_cdec.pyx":81
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-  /* "_cdec.pyx":82
+  /* "_cdec.pyx":83
  *         def __get__(self):
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+  __pyx_t_1 = PyBytes_FromString(((__pyx_v_conf[0])[__pyx_k__formalism]).as<std::string>().c_str()); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 83; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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 }
 
-/* "_cdec.pyx":84
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-  /* "_cdec.pyx":85
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@@ -13403,19 +15959,19 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
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+    __pyx_t_1 = PyObject_GetAttr(__pyx_t_2, __pyx_n_s____enter__); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 86; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
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-          /* "_cdec.pyx":86
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+            __pyx_t_8 = -1; __pyx_t_4 = PyObject_GetIter(__pyx_v_fp); if (unlikely(!__pyx_t_4)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 87; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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-            /* "_cdec.pyx":87
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+            __pyx_t_1 = PyObject_Call(__pyx_t_2, ((PyObject *)__pyx_k_tuple_49), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 88; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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+            __pyx_t_10 = __Pyx_PyObject_IsTrue(__pyx_t_1); if (unlikely(__pyx_t_10 < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 88; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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-            /* "_cdec.pyx":88
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+            __pyx_t_1 = PyObject_GetAttr(__pyx_v_line, __pyx_n_s__split); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 89; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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-            __pyx_t_2 = PyObject_Call(__pyx_t_1, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 88; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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@@ -13511,7 +16067,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
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-                  {__pyx_filename = __pyx_f[0]; __pyx_lineno = 88; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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@@ -13519,7 +16075,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_4read_weights(struct __pyx_obj_5_cdec_
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-                  {__pyx_filename = __pyx_f[0]; __pyx_lineno = 88; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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+              if (__Pyx_IternextUnpackEndCheck(__pyx_t_13(__pyx_t_12), 2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 89; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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-              {__pyx_filename = __pyx_f[0]; __pyx_lineno = 88; __pyx_clineno = __LINE__; goto __pyx_L7_error;}
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-    __Pyx_GIVEREF(((PyObject *)__pyx_t_3));
-    __pyx_t_3 = 0;
-    __pyx_t_3 = PyObject_Call(__pyx_builtin_TypeError, ((PyObject *)__pyx_t_1), NULL); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 99; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-    __Pyx_GOTREF(__pyx_t_3);
+    PyTuple_SET_ITEM(__pyx_t_1, 0, ((PyObject *)__pyx_t_5));
+    __Pyx_GIVEREF(((PyObject *)__pyx_t_5));
+    __pyx_t_5 = 0;
+    __pyx_t_5 = PyObject_Call(__pyx_builtin_TypeError, ((PyObject *)__pyx_t_1), NULL); if (unlikely(!__pyx_t_5)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 99; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __Pyx_GOTREF(__pyx_t_5);
     __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
-    __Pyx_Raise(__pyx_t_3, 0, 0, 0);
-    __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
+    __Pyx_Raise(__pyx_t_5, 0, 0, 0);
+    __Pyx_DECREF(__pyx_t_5); __pyx_t_5 = 0;
     {__pyx_filename = __pyx_f[0]; __pyx_lineno = 99; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   }
   __pyx_L3:;
@@ -13897,86 +16432,130 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_6translate(struct __pyx_obj_5_cdec_Dec
  *         else:
  *             raise TypeError('Cannot translate input type %s' % type(sentence))
  *         if grammar:             # <<<<<<<<<<<<<<
- *             self.dec.SetSentenceGrammarFromString(string(<char *> grammar))
- *         cdef decoder.BasicObserver observer = decoder.BasicObserver()
+ *             if isinstance(grammar, str) or isinstance(grammar, unicode):
+ *                 self.dec.AddSupplementalGrammarFromString(string(as_str(grammar)))
  */
-  __pyx_t_2 = __Pyx_PyObject_IsTrue(__pyx_v_grammar); if (unlikely(__pyx_t_2 < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 100; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__pyx_t_2) {
+  __pyx_t_4 = __Pyx_PyObject_IsTrue(__pyx_v_grammar); if (unlikely(__pyx_t_4 < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 100; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__pyx_t_4) {
 
     /* "_cdec.pyx":101
  *             raise TypeError('Cannot translate input type %s' % type(sentence))
  *         if grammar:
- *             self.dec.SetSentenceGrammarFromString(string(<char *> grammar))             # <<<<<<<<<<<<<<
+ *             if isinstance(grammar, str) or isinstance(grammar, unicode):             # <<<<<<<<<<<<<<
+ *                 self.dec.AddSupplementalGrammarFromString(string(as_str(grammar)))
+ *             else:
+ */
+    __pyx_t_5 = ((PyObject *)((PyObject*)(&PyString_Type)));
+    __Pyx_INCREF(__pyx_t_5);
+    __pyx_t_4 = __Pyx_TypeCheck(__pyx_v_grammar, __pyx_t_5); 
+    __Pyx_DECREF(__pyx_t_5); __pyx_t_5 = 0;
+    if (!__pyx_t_4) {
+      __pyx_t_5 = ((PyObject *)((PyObject*)(&PyUnicode_Type)));
+      __Pyx_INCREF(__pyx_t_5);
+      __pyx_t_2 = __Pyx_TypeCheck(__pyx_v_grammar, __pyx_t_5); 
+      __Pyx_DECREF(__pyx_t_5); __pyx_t_5 = 0;
+      __pyx_t_3 = __pyx_t_2;
+    } else {
+      __pyx_t_3 = __pyx_t_4;
+    }
+    if (__pyx_t_3) {
+
+      /* "_cdec.pyx":102
+ *         if grammar:
+ *             if isinstance(grammar, str) or isinstance(grammar, unicode):
+ *                 self.dec.AddSupplementalGrammarFromString(string(as_str(grammar)))             # <<<<<<<<<<<<<<
+ *             else:
+ *                 self.dec.AddSupplementalGrammar(TextGrammar(grammar).grammar[0])
+ */
+      __pyx_v_self->dec->AddSupplementalGrammarFromString(std::string(__pyx_f_5_cdec_as_str(__pyx_v_grammar, NULL)));
+      goto __pyx_L5;
+    }
+    /*else*/ {
+
+      /* "_cdec.pyx":104
+ *                 self.dec.AddSupplementalGrammarFromString(string(as_str(grammar)))
+ *             else:
+ *                 self.dec.AddSupplementalGrammar(TextGrammar(grammar).grammar[0])             # <<<<<<<<<<<<<<
  *         cdef decoder.BasicObserver observer = decoder.BasicObserver()
- *         self.dec.Decode(string(<char *>inp), &observer)
+ *         self.dec.Decode(string(input_str), &observer)
  */
-    __pyx_t_4 = PyBytes_AsString(__pyx_v_grammar); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 101; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-    __pyx_v_self->dec->SetSentenceGrammarFromString(std::string(((char *)__pyx_t_4)));
+      __pyx_t_5 = PyTuple_New(1); if (unlikely(!__pyx_t_5)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 104; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __Pyx_GOTREF(__pyx_t_5);
+      __Pyx_INCREF(__pyx_v_grammar);
+      PyTuple_SET_ITEM(__pyx_t_5, 0, __pyx_v_grammar);
+      __Pyx_GIVEREF(__pyx_v_grammar);
+      __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_TextGrammar)), ((PyObject *)__pyx_t_5), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 104; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __Pyx_GOTREF(__pyx_t_1);
+      __Pyx_DECREF(((PyObject *)__pyx_t_5)); __pyx_t_5 = 0;
+      __pyx_v_self->dec->AddSupplementalGrammar((((struct __pyx_obj_5_cdec_TextGrammar *)__pyx_t_1)->__pyx_base.grammar[0]));
+      __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+    }
+    __pyx_L5:;
     goto __pyx_L4;
   }
   __pyx_L4:;
 
-  /* "_cdec.pyx":102
- *         if grammar:
- *             self.dec.SetSentenceGrammarFromString(string(<char *> grammar))
+  /* "_cdec.pyx":105
+ *             else:
+ *                 self.dec.AddSupplementalGrammar(TextGrammar(grammar).grammar[0])
  *         cdef decoder.BasicObserver observer = decoder.BasicObserver()             # <<<<<<<<<<<<<<
- *         self.dec.Decode(string(<char *>inp), &observer)
+ *         self.dec.Decode(string(input_str), &observer)
  *         if observer.hypergraph == NULL:
  */
   __pyx_v_observer = BasicObserver();
 
-  /* "_cdec.pyx":103
- *             self.dec.SetSentenceGrammarFromString(string(<char *> grammar))
+  /* "_cdec.pyx":106
+ *                 self.dec.AddSupplementalGrammar(TextGrammar(grammar).grammar[0])
  *         cdef decoder.BasicObserver observer = decoder.BasicObserver()
- *         self.dec.Decode(string(<char *>inp), &observer)             # <<<<<<<<<<<<<<
+ *         self.dec.Decode(string(input_str), &observer)             # <<<<<<<<<<<<<<
  *         if observer.hypergraph == NULL:
  *             raise ParseFailed()
  */
-  __pyx_t_4 = PyBytes_AsString(__pyx_v_inp); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 103; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_v_self->dec->Decode(std::string(((char *)__pyx_t_4)), (&__pyx_v_observer));
+  __pyx_t_6 = PyBytes_AsString(((PyObject *)__pyx_v_input_str)); if (unlikely((!__pyx_t_6) && PyErr_Occurred())) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 106; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_v_self->dec->Decode(std::string(__pyx_t_6), (&__pyx_v_observer));
 
-  /* "_cdec.pyx":104
+  /* "_cdec.pyx":107
  *         cdef decoder.BasicObserver observer = decoder.BasicObserver()
- *         self.dec.Decode(string(<char *>inp), &observer)
+ *         self.dec.Decode(string(input_str), &observer)
  *         if observer.hypergraph == NULL:             # <<<<<<<<<<<<<<
  *             raise ParseFailed()
  *         cdef Hypergraph hg = Hypergraph()
  */
-  __pyx_t_2 = (__pyx_v_observer.hypergraph == NULL);
-  if (__pyx_t_2) {
+  __pyx_t_3 = (__pyx_v_observer.hypergraph == NULL);
+  if (__pyx_t_3) {
 
-    /* "_cdec.pyx":105
- *         self.dec.Decode(string(<char *>inp), &observer)
+    /* "_cdec.pyx":108
+ *         self.dec.Decode(string(input_str), &observer)
  *         if observer.hypergraph == NULL:
  *             raise ParseFailed()             # <<<<<<<<<<<<<<
  *         cdef Hypergraph hg = Hypergraph()
  *         hg.hg = new hypergraph.Hypergraph(observer.hypergraph[0])
  */
-    __pyx_t_3 = __Pyx_GetName(__pyx_m, __pyx_n_s__ParseFailed); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-    __Pyx_GOTREF(__pyx_t_3);
-    __pyx_t_1 = PyObject_Call(__pyx_t_3, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __pyx_t_1 = __Pyx_GetName(__pyx_m, __pyx_n_s__ParseFailed); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 108; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
     __Pyx_GOTREF(__pyx_t_1);
-    __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-    __Pyx_Raise(__pyx_t_1, 0, 0, 0);
+    __pyx_t_5 = PyObject_Call(__pyx_t_1, ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_5)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 108; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    __Pyx_GOTREF(__pyx_t_5);
     __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
-    {__pyx_filename = __pyx_f[0]; __pyx_lineno = 105; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-    goto __pyx_L5;
+    __Pyx_Raise(__pyx_t_5, 0, 0, 0);
+    __Pyx_DECREF(__pyx_t_5); __pyx_t_5 = 0;
+    {__pyx_filename = __pyx_f[0]; __pyx_lineno = 108; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    goto __pyx_L6;
   }
-  __pyx_L5:;
+  __pyx_L6:;
 
-  /* "_cdec.pyx":106
+  /* "_cdec.pyx":109
  *         if observer.hypergraph == NULL:
  *             raise ParseFailed()
  *         cdef Hypergraph hg = Hypergraph()             # <<<<<<<<<<<<<<
  *         hg.hg = new hypergraph.Hypergraph(observer.hypergraph[0])
  *         return hg
  */
-  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_Hypergraph)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 106; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __Pyx_GOTREF(__pyx_t_1);
-  __pyx_v_hg = ((struct __pyx_obj_5_cdec_Hypergraph *)__pyx_t_1);
-  __pyx_t_1 = 0;
+  __pyx_t_5 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_Hypergraph)), ((PyObject *)__pyx_empty_tuple), NULL); if (unlikely(!__pyx_t_5)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 109; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_5);
+  __pyx_v_hg = ((struct __pyx_obj_5_cdec_Hypergraph *)__pyx_t_5);
+  __pyx_t_5 = 0;
 
-  /* "_cdec.pyx":107
+  /* "_cdec.pyx":110
  *             raise ParseFailed()
  *         cdef Hypergraph hg = Hypergraph()
  *         hg.hg = new hypergraph.Hypergraph(observer.hypergraph[0])             # <<<<<<<<<<<<<<
@@ -13984,7 +16563,7 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_6translate(struct __pyx_obj_5_cdec_Dec
  */
   __pyx_v_hg->hg = new Hypergraph((__pyx_v_observer.hypergraph[0]));
 
-  /* "_cdec.pyx":108
+  /* "_cdec.pyx":111
  *         cdef Hypergraph hg = Hypergraph()
  *         hg.hg = new hypergraph.Hypergraph(observer.hypergraph[0])
  *         return hg             # <<<<<<<<<<<<<<
@@ -13998,11 +16577,11 @@ static PyObject *__pyx_pf_5_cdec_7Decoder_6translate(struct __pyx_obj_5_cdec_Dec
   goto __pyx_L0;
   __pyx_L1_error:;
   __Pyx_XDECREF(__pyx_t_1);
-  __Pyx_XDECREF(__pyx_t_3);
+  __Pyx_XDECREF(__pyx_t_5);
   __Pyx_AddTraceback("_cdec.Decoder.translate", __pyx_clineno, __pyx_lineno, __pyx_filename);
   __pyx_r = NULL;
   __pyx_L0:;
-  __Pyx_XDECREF(__pyx_v_inp);
+  __Pyx_XDECREF(__pyx_v_input_str);
   __Pyx_XDECREF((PyObject *)__pyx_v_hg);
   __Pyx_XGIVEREF(__pyx_r);
   __Pyx_RefNannyFinishContext();
@@ -14394,61 +16973,55 @@ static PyTypeObject __pyx_type_5_cdec_SparseVector = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec_Hypergraph(PyTypeObject *t, PyObject *a, PyObject *k) {
+static PyObject *__pyx_tp_new_5_cdec_NT(PyTypeObject *t, PyObject *a, PyObject *k) {
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec_Hypergraph(PyObject *o) {
-  {
-    PyObject *etype, *eval, *etb;
-    PyErr_Fetch(&etype, &eval, &etb);
-    ++Py_REFCNT(o);
-    __pyx_pw_5_cdec_10Hypergraph_1__dealloc__(o);
-    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
-    --Py_REFCNT(o);
-    PyErr_Restore(etype, eval, etb);
-  }
+static void __pyx_tp_dealloc_5_cdec_NT(PyObject *o) {
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static PyObject *__pyx_getprop_5_cdec_10Hypergraph_edges(PyObject *o, void *x) {
-  return __pyx_pw_5_cdec_10Hypergraph_5edges_1__get__(o);
+static PyObject *__pyx_getprop_5_cdec_2NT_cat(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_2NT_3cat_1__get__(o);
 }
 
-static PyObject *__pyx_getprop_5_cdec_10Hypergraph_nodes(PyObject *o, void *x) {
-  return __pyx_pw_5_cdec_10Hypergraph_5nodes_1__get__(o);
+static int __pyx_setprop_5_cdec_2NT_cat(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_2NT_3cat_3__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
 }
 
-static PyObject *__pyx_getprop_5_cdec_10Hypergraph_goal(PyObject *o, void *x) {
-  return __pyx_pw_5_cdec_10Hypergraph_4goal_1__get__(o);
+static PyObject *__pyx_getprop_5_cdec_2NT_ref(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_2NT_3ref_1__get__(o);
 }
 
-static PyMethodDef __pyx_methods_5_cdec_Hypergraph[] = {
-  {__Pyx_NAMESTR("viterbi"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_3viterbi, METH_NOARGS, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("viterbi_trees"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_5viterbi_trees, METH_NOARGS, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("viterbi_features"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_7viterbi_features, METH_NOARGS, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("viterbi_joshua"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_9viterbi_joshua, METH_NOARGS, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("kbest"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_11kbest, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("kbest_trees"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_14kbest_trees, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("kbest_features"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_17kbest_features, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("sample"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_20sample, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("intersect"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_23intersect, METH_O, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("prune"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_25prune, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("lattice"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_27lattice, METH_NOARGS, __Pyx_DOCSTR(0)},
-  {__Pyx_NAMESTR("reweight"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_29reweight, METH_O, __Pyx_DOCSTR(0)},
+static int __pyx_setprop_5_cdec_2NT_ref(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_2NT_3ref_3__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyMethodDef __pyx_methods_5_cdec_NT[] = {
   {0, 0, 0, 0}
 };
 
-static struct PyGetSetDef __pyx_getsets_5_cdec_Hypergraph[] = {
-  {(char *)"edges", __pyx_getprop_5_cdec_10Hypergraph_edges, 0, 0, 0},
-  {(char *)"nodes", __pyx_getprop_5_cdec_10Hypergraph_nodes, 0, 0, 0},
-  {(char *)"goal", __pyx_getprop_5_cdec_10Hypergraph_goal, 0, 0, 0},
+static struct PyGetSetDef __pyx_getsets_5_cdec_NT[] = {
+  {(char *)"cat", __pyx_getprop_5_cdec_2NT_cat, __pyx_setprop_5_cdec_2NT_cat, 0, 0},
+  {(char *)"ref", __pyx_getprop_5_cdec_2NT_ref, __pyx_setprop_5_cdec_2NT_ref, 0, 0},
   {0, 0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number_Hypergraph = {
+static PyNumberMethods __pyx_tp_as_number_NT = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -14506,7 +17079,7 @@ static PyNumberMethods __pyx_tp_as_number_Hypergraph = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence_Hypergraph = {
+static PySequenceMethods __pyx_tp_as_sequence_NT = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -14519,13 +17092,13 @@ static PySequenceMethods __pyx_tp_as_sequence_Hypergraph = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping_Hypergraph = {
+static PyMappingMethods __pyx_tp_as_mapping_NT = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer_Hypergraph = {
+static PyBufferProcs __pyx_tp_as_buffer_NT = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -14546,12 +17119,12 @@ static PyBufferProcs __pyx_tp_as_buffer_Hypergraph = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec_Hypergraph = {
+static PyTypeObject __pyx_type_5_cdec_NT = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.Hypergraph"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec_Hypergraph), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.NT"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_NT), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec_Hypergraph, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec_NT, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -14561,15 +17134,15 @@ static PyTypeObject __pyx_type_5_cdec_Hypergraph = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number_Hypergraph, /*tp_as_number*/
-  &__pyx_tp_as_sequence_Hypergraph, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping_Hypergraph, /*tp_as_mapping*/
+  &__pyx_tp_as_number_NT, /*tp_as_number*/
+  &__pyx_tp_as_sequence_NT, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_NT, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
-  0, /*tp_str*/
+  __pyx_pw_5_cdec_2NT_3__str__, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer_Hypergraph, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer_NT, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
   0, /*tp_doc*/
   0, /*tp_traverse*/
@@ -14578,17 +17151,17 @@ static PyTypeObject __pyx_type_5_cdec_Hypergraph = {
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec_Hypergraph, /*tp_methods*/
+  __pyx_methods_5_cdec_NT, /*tp_methods*/
   0, /*tp_members*/
-  __pyx_getsets_5_cdec_Hypergraph, /*tp_getset*/
+  __pyx_getsets_5_cdec_NT, /*tp_getset*/
   0, /*tp_base*/
   0, /*tp_dict*/
   0, /*tp_descr_get*/
   0, /*tp_descr_set*/
   0, /*tp_dictoffset*/
-  0, /*tp_init*/
+  __pyx_pw_5_cdec_2NT_1__init__, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec_Hypergraph, /*tp_new*/
+  __pyx_tp_new_5_cdec_NT, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -14602,49 +17175,467 @@ static PyTypeObject __pyx_type_5_cdec_Hypergraph = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec_TRule(PyTypeObject *t, PyObject *a, PyObject *k) {
+static PyObject *__pyx_tp_new_5_cdec_NTRef(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec_NTRef(PyObject *o) {
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_5NTRef_ref(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_5NTRef_3ref_1__get__(o);
+}
+
+static int __pyx_setprop_5_cdec_5NTRef_ref(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_5NTRef_3ref_3__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyMethodDef __pyx_methods_5_cdec_NTRef[] = {
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_5_cdec_NTRef[] = {
+  {(char *)"ref", __pyx_getprop_5_cdec_5NTRef_ref, __pyx_setprop_5_cdec_5NTRef_ref, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_NTRef = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_NTRef = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_NTRef = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_NTRef = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_NTRef = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.NTRef"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_NTRef), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_NTRef, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_NTRef, /*tp_as_number*/
+  &__pyx_tp_as_sequence_NTRef, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_NTRef, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  __pyx_pw_5_cdec_5NTRef_3__str__, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_NTRef, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_NTRef, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_5_cdec_NTRef, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  __pyx_pw_5_cdec_5NTRef_1__init__, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_NTRef, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec_BaseTRule(PyTypeObject *t, PyObject *a, PyObject *k) {
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec_TRule(PyObject *o) {
+static void __pyx_tp_dealloc_5_cdec_BaseTRule(PyObject *o) {
+  {
+    PyObject *etype, *eval, *etb;
+    PyErr_Fetch(&etype, &eval, &etb);
+    ++Py_REFCNT(o);
+    __pyx_pw_5_cdec_9BaseTRule_1__dealloc__(o);
+    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
+    --Py_REFCNT(o);
+    PyErr_Restore(etype, eval, etb);
+  }
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static PyObject *__pyx_getprop_5_cdec_5TRule_arity(PyObject *o, void *x) {
-  return __pyx_pw_5_cdec_5TRule_5arity_1__get__(o);
+static PyObject *__pyx_getprop_5_cdec_9BaseTRule_arity(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_9BaseTRule_5arity_1__get__(o);
 }
 
-static PyObject *__pyx_getprop_5_cdec_5TRule_f(PyObject *o, void *x) {
-  return __pyx_pw_5_cdec_5TRule_1f_1__get__(o);
+static PyObject *__pyx_getprop_5_cdec_9BaseTRule_f(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_9BaseTRule_1f_1__get__(o);
 }
 
-static PyObject *__pyx_getprop_5_cdec_5TRule_e(PyObject *o, void *x) {
-  return __pyx_pw_5_cdec_5TRule_1e_1__get__(o);
+static int __pyx_setprop_5_cdec_9BaseTRule_f(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_9BaseTRule_1f_3__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
 }
 
-static PyObject *__pyx_getprop_5_cdec_5TRule_scores(PyObject *o, void *x) {
-  return __pyx_pw_5_cdec_5TRule_6scores_1__get__(o);
+static PyObject *__pyx_getprop_5_cdec_9BaseTRule_e(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_9BaseTRule_1e_1__get__(o);
 }
 
-static PyObject *__pyx_getprop_5_cdec_5TRule_lhs(PyObject *o, void *x) {
-  return __pyx_pw_5_cdec_5TRule_3lhs_1__get__(o);
+static int __pyx_setprop_5_cdec_9BaseTRule_e(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_9BaseTRule_1e_3__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
 }
 
-static PyMethodDef __pyx_methods_5_cdec_TRule[] = {
+static PyObject *__pyx_getprop_5_cdec_9BaseTRule_a(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_9BaseTRule_1a_1__get__(o);
+}
+
+static int __pyx_setprop_5_cdec_9BaseTRule_a(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_9BaseTRule_1a_4__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyObject *__pyx_getprop_5_cdec_9BaseTRule_scores(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_9BaseTRule_6scores_1__get__(o);
+}
+
+static int __pyx_setprop_5_cdec_9BaseTRule_scores(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_9BaseTRule_6scores_3__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyObject *__pyx_getprop_5_cdec_9BaseTRule_lhs(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_9BaseTRule_3lhs_1__get__(o);
+}
+
+static int __pyx_setprop_5_cdec_9BaseTRule_lhs(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_9BaseTRule_3lhs_3__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyMethodDef __pyx_methods_5_cdec_BaseTRule[] = {
   {0, 0, 0, 0}
 };
 
-static struct PyGetSetDef __pyx_getsets_5_cdec_TRule[] = {
-  {(char *)"arity", __pyx_getprop_5_cdec_5TRule_arity, 0, 0, 0},
-  {(char *)"f", __pyx_getprop_5_cdec_5TRule_f, 0, 0, 0},
-  {(char *)"e", __pyx_getprop_5_cdec_5TRule_e, 0, 0, 0},
-  {(char *)"scores", __pyx_getprop_5_cdec_5TRule_scores, 0, 0, 0},
-  {(char *)"lhs", __pyx_getprop_5_cdec_5TRule_lhs, 0, 0, 0},
+static struct PyGetSetDef __pyx_getsets_5_cdec_BaseTRule[] = {
+  {(char *)"arity", __pyx_getprop_5_cdec_9BaseTRule_arity, 0, 0, 0},
+  {(char *)"f", __pyx_getprop_5_cdec_9BaseTRule_f, __pyx_setprop_5_cdec_9BaseTRule_f, 0, 0},
+  {(char *)"e", __pyx_getprop_5_cdec_9BaseTRule_e, __pyx_setprop_5_cdec_9BaseTRule_e, 0, 0},
+  {(char *)"a", __pyx_getprop_5_cdec_9BaseTRule_a, __pyx_setprop_5_cdec_9BaseTRule_a, 0, 0},
+  {(char *)"scores", __pyx_getprop_5_cdec_9BaseTRule_scores, __pyx_setprop_5_cdec_9BaseTRule_scores, 0, 0},
+  {(char *)"lhs", __pyx_getprop_5_cdec_9BaseTRule_lhs, __pyx_setprop_5_cdec_9BaseTRule_lhs, 0, 0},
   {0, 0, 0, 0, 0}
 };
 
+static PyNumberMethods __pyx_tp_as_number_BaseTRule = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_BaseTRule = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_BaseTRule = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_BaseTRule = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_BaseTRule = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.BaseTRule"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_BaseTRule), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_BaseTRule, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_BaseTRule, /*tp_as_number*/
+  &__pyx_tp_as_sequence_BaseTRule, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_BaseTRule, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  __pyx_pw_5_cdec_9BaseTRule_3__str__, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_BaseTRule, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_BaseTRule, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_5_cdec_BaseTRule, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_BaseTRule, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec_TRule(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = __pyx_tp_new_5_cdec_BaseTRule(t, a, k);
+  if (!o) return 0;
+  if (__pyx_pw_5_cdec_5TRule_1__cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static PyMethodDef __pyx_methods_5_cdec_TRule[] = {
+  {0, 0, 0, 0}
+};
+
 static PyNumberMethods __pyx_tp_as_number_TRule = {
   0, /*nb_add*/
   0, /*nb_subtract*/
@@ -14748,7 +17739,7 @@ static PyTypeObject __pyx_type_5_cdec_TRule = {
   __Pyx_NAMESTR("_cdec.TRule"), /*tp_name*/
   sizeof(struct __pyx_obj_5_cdec_TRule), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec_TRule, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec_BaseTRule, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -14763,7 +17754,7 @@ static PyTypeObject __pyx_type_5_cdec_TRule = {
   &__pyx_tp_as_mapping_TRule, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
-  __pyx_pw_5_cdec_5TRule_1__str__, /*tp_str*/
+  0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
   &__pyx_tp_as_buffer_TRule, /*tp_as_buffer*/
@@ -14777,7 +17768,7 @@ static PyTypeObject __pyx_type_5_cdec_TRule = {
   0, /*tp_iternext*/
   __pyx_methods_5_cdec_TRule, /*tp_methods*/
   0, /*tp_members*/
-  __pyx_getsets_5_cdec_TRule, /*tp_getset*/
+  0, /*tp_getset*/
   0, /*tp_base*/
   0, /*tp_dict*/
   0, /*tp_descr_get*/
@@ -14798,6 +17789,583 @@ static PyTypeObject __pyx_type_5_cdec_TRule = {
   0, /*tp_version_tag*/
   #endif
 };
+
+static PyObject *__pyx_tp_new_5_cdec_Grammar(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec_Grammar(PyObject *o) {
+  {
+    PyObject *etype, *eval, *etb;
+    PyErr_Fetch(&etype, &eval, &etb);
+    ++Py_REFCNT(o);
+    __pyx_pw_5_cdec_7Grammar_1__dealloc__(o);
+    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
+    --Py_REFCNT(o);
+    PyErr_Restore(etype, eval, etb);
+  }
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_7Grammar_name(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_7Grammar_4name_1__get__(o);
+}
+
+static int __pyx_setprop_5_cdec_7Grammar_name(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pw_5_cdec_7Grammar_4name_3__set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyMethodDef __pyx_methods_5_cdec_Grammar[] = {
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_5_cdec_Grammar[] = {
+  {(char *)"name", __pyx_getprop_5_cdec_7Grammar_name, __pyx_setprop_5_cdec_7Grammar_name, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_Grammar = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_Grammar = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_Grammar = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_Grammar = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_Grammar = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.Grammar"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_Grammar), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_Grammar, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_Grammar, /*tp_as_number*/
+  &__pyx_tp_as_sequence_Grammar, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_Grammar, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_Grammar, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  __pyx_pw_5_cdec_7Grammar_3__iter__, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_Grammar, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_5_cdec_Grammar, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_Grammar, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec_TextGrammar(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = __pyx_tp_new_5_cdec_Grammar(t, a, k);
+  if (!o) return 0;
+  if (__pyx_pw_5_cdec_11TextGrammar_1__cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static PyMethodDef __pyx_methods_5_cdec_TextGrammar[] = {
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_TextGrammar = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_TextGrammar = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_TextGrammar = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_TextGrammar = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_TextGrammar = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.TextGrammar"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_TextGrammar), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_Grammar, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_TextGrammar, /*tp_as_number*/
+  &__pyx_tp_as_sequence_TextGrammar, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_TextGrammar, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_TextGrammar, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_TextGrammar, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_TextGrammar, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec_Hypergraph(PyTypeObject *t, PyObject *a, PyObject *k) {
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec_Hypergraph(PyObject *o) {
+  {
+    PyObject *etype, *eval, *etb;
+    PyErr_Fetch(&etype, &eval, &etb);
+    ++Py_REFCNT(o);
+    __pyx_pw_5_cdec_10Hypergraph_1__dealloc__(o);
+    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
+    --Py_REFCNT(o);
+    PyErr_Restore(etype, eval, etb);
+  }
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_10Hypergraph_edges(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_10Hypergraph_5edges_1__get__(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_10Hypergraph_nodes(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_10Hypergraph_5nodes_1__get__(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_10Hypergraph_goal(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_10Hypergraph_4goal_1__get__(o);
+}
+
+static PyObject *__pyx_getprop_5_cdec_10Hypergraph_npaths(PyObject *o, void *x) {
+  return __pyx_pw_5_cdec_10Hypergraph_6npaths_1__get__(o);
+}
+
+static PyMethodDef __pyx_methods_5_cdec_Hypergraph[] = {
+  {__Pyx_NAMESTR("viterbi"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_3viterbi, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("viterbi_trees"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_5viterbi_trees, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("viterbi_features"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_7viterbi_features, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("viterbi_joshua"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_9viterbi_joshua, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("kbest"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_11kbest, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("kbest_trees"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_14kbest_trees, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("kbest_features"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_17kbest_features, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("sample"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_20sample, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("intersect"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_23intersect, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("prune"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_25prune, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("lattice"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_27lattice, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("reweight"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_29reweight, METH_O, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("inside_outside"), (PyCFunction)__pyx_pw_5_cdec_10Hypergraph_31inside_outside, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_5_cdec_Hypergraph[] = {
+  {(char *)"edges", __pyx_getprop_5_cdec_10Hypergraph_edges, 0, 0, 0},
+  {(char *)"nodes", __pyx_getprop_5_cdec_10Hypergraph_nodes, 0, 0, 0},
+  {(char *)"goal", __pyx_getprop_5_cdec_10Hypergraph_goal, 0, 0, 0},
+  {(char *)"npaths", __pyx_getprop_5_cdec_10Hypergraph_npaths, 0, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_Hypergraph = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_Hypergraph = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_Hypergraph = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_Hypergraph = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec_Hypergraph = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.Hypergraph"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec_Hypergraph), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec_Hypergraph, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_Hypergraph, /*tp_as_number*/
+  &__pyx_tp_as_sequence_Hypergraph, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_Hypergraph, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_Hypergraph, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_BASETYPE, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec_Hypergraph, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_5_cdec_Hypergraph, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec_Hypergraph, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
 static struct __pyx_vtabstruct_5_cdec_HypergraphEdge __pyx_vtable_5_cdec_HypergraphEdge;
 
 static PyObject *__pyx_tp_new_5_cdec_HypergraphEdge(PyTypeObject *t, PyObject *a, PyObject *k) {
@@ -14806,7 +18374,7 @@ static PyObject *__pyx_tp_new_5_cdec_HypergraphEdge(PyTypeObject *t, PyObject *a
   if (!o) return 0;
   p = ((struct __pyx_obj_5_cdec_HypergraphEdge *)o);
   p->__pyx_vtab = __pyx_vtabptr_5_cdec_HypergraphEdge;
-  p->trule = ((struct __pyx_obj_5_cdec_TRule *)Py_None); Py_INCREF(Py_None);
+  p->trule = ((struct __pyx_obj_5_cdec_BaseTRule *)Py_None); Py_INCREF(Py_None);
   return o;
 }
 
@@ -14829,7 +18397,7 @@ static int __pyx_tp_clear_5_cdec_HypergraphEdge(PyObject *o) {
   struct __pyx_obj_5_cdec_HypergraphEdge *p = (struct __pyx_obj_5_cdec_HypergraphEdge *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->trule);
-  p->trule = ((struct __pyx_obj_5_cdec_TRule *)Py_None); Py_INCREF(Py_None);
+  p->trule = ((struct __pyx_obj_5_cdec_BaseTRule *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
@@ -15234,6 +18802,9 @@ static PyTypeObject __pyx_type_5_cdec_HypergraphNode = {
 static PyObject *__pyx_tp_new_5_cdec_Lattice(PyTypeObject *t, PyObject *a, PyObject *k) {
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
+  if (__pyx_pw_5_cdec_7Lattice_1__cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
   return o;
 }
 
@@ -15411,7 +18982,7 @@ static PyTypeObject __pyx_type_5_cdec_Lattice = {
   0, /*tp_descr_get*/
   0, /*tp_descr_set*/
   0, /*tp_dictoffset*/
-  __pyx_pw_5_cdec_7Lattice_1__init__, /*tp_init*/
+  0, /*tp_init*/
   0, /*tp_alloc*/
   __pyx_tp_new_5_cdec_Lattice, /*tp_new*/
   0, /*tp_free*/
@@ -16973,52 +20544,44 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_1___iter__ = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_2_kbest(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_2__phrase(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest *)o);
-  p->__pyx_v_self = 0;
-  p->__pyx_v_size = 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *)o);
+  p->__pyx_v_phrase = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_2_kbest(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest *)o;
-  Py_XDECREF(((PyObject *)p->__pyx_v_self));
-  Py_XDECREF(p->__pyx_v_size);
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_2__phrase(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *)o;
+  Py_XDECREF(p->__pyx_v_phrase);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_2_kbest(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_2__phrase(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest *)o;
-  if (p->__pyx_v_self) {
-    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
-  }
-  if (p->__pyx_v_size) {
-    e = (*v)(p->__pyx_v_size, a); if (e) return e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *)o;
+  if (p->__pyx_v_phrase) {
+    e = (*v)(p->__pyx_v_phrase, a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_2_kbest(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_2__phrase(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *)o;
   PyObject* tmp;
-  tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->__pyx_v_size);
-  p->__pyx_v_size = Py_None; Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_v_phrase);
+  p->__pyx_v_phrase = Py_None; Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_2_kbest[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_2__phrase[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_2_kbest = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_2__phrase = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -17076,7 +20639,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_2_kbest = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_2_kbest = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_2__phrase = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -17089,13 +20652,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_2_kbest = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_2_kbest = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_2__phrase = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_2_kbest = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_2__phrase = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -17116,12 +20679,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_2_kbest = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_2_kbest = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_2__phrase = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_2_kbest"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_2_kbest), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_2__phrase"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_2_kbest, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_2__phrase, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -17131,24 +20694,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_2_kbest = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_2_kbest, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_2_kbest, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_2_kbest, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_2__phrase, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_2__phrase, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_2__phrase, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_2_kbest, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_2__phrase, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_2_kbest, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_2_kbest, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_2__phrase, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_2__phrase, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_2_kbest, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_2__phrase, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -17158,7 +20721,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_2_kbest = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_2_kbest, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_2__phrase, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -17172,68 +20735,60 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_2_kbest = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_3_kbest_trees(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_3_genexpr(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees *)o);
-  p->__pyx_v_e_tree = 0;
-  p->__pyx_v_f_tree = 0;
-  p->__pyx_v_self = 0;
-  p->__pyx_v_size = 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr *)o);
+  p->__pyx_outer_scope = 0;
+  p->__pyx_v_w = 0;
+  p->__pyx_t_0 = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_3_kbest_trees(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees *)o;
-  Py_XDECREF(((PyObject *)p->__pyx_v_e_tree));
-  Py_XDECREF(((PyObject *)p->__pyx_v_f_tree));
-  Py_XDECREF(((PyObject *)p->__pyx_v_self));
-  Py_XDECREF(p->__pyx_v_size);
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_3_genexpr(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_outer_scope));
+  Py_XDECREF(p->__pyx_v_w);
+  Py_XDECREF(p->__pyx_t_0);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_3_kbest_trees(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_3_genexpr(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees *)o;
-  if (p->__pyx_v_e_tree) {
-    e = (*v)(p->__pyx_v_e_tree, a); if (e) return e;
-  }
-  if (p->__pyx_v_f_tree) {
-    e = (*v)(p->__pyx_v_f_tree, a); if (e) return e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr *)o;
+  if (p->__pyx_outer_scope) {
+    e = (*v)(((PyObject*)p->__pyx_outer_scope), a); if (e) return e;
   }
-  if (p->__pyx_v_self) {
-    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  if (p->__pyx_v_w) {
+    e = (*v)(p->__pyx_v_w, a); if (e) return e;
   }
-  if (p->__pyx_v_size) {
-    e = (*v)(p->__pyx_v_size, a); if (e) return e;
+  if (p->__pyx_t_0) {
+    e = (*v)(p->__pyx_t_0, a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_3_kbest_trees(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_3_genexpr(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr *)o;
   PyObject* tmp;
-  tmp = ((PyObject*)p->__pyx_v_e_tree);
-  p->__pyx_v_e_tree = ((PyObject*)Py_None); Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->__pyx_v_f_tree);
-  p->__pyx_v_f_tree = ((PyObject*)Py_None); Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_outer_scope);
+  p->__pyx_outer_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_2__phrase *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_v_w);
+  p->__pyx_v_w = Py_None; Py_INCREF(Py_None);
   Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->__pyx_v_size);
-  p->__pyx_v_size = Py_None; Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_t_0);
+  p->__pyx_t_0 = Py_None; Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_3_kbest_trees[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_3_genexpr[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_3_kbest_trees = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_3_genexpr = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -17291,7 +20846,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_3_kbest_trees = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_3_kbest_trees = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_3_genexpr = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -17304,13 +20859,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_3_kbest_trees =
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_3_kbest_trees = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_3_genexpr = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_3_kbest_trees = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_3_genexpr = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -17331,12 +20886,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_3_kbest_trees = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_3_kbest_trees = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_3_genexpr = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_3_kbest_trees"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_3_kbest_trees), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_3_genexpr"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_3_genexpr), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_3_kbest_trees, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_3_genexpr, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -17346,24 +20901,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_3_kbest_trees = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_3_kbest_trees, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_3_kbest_trees, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_3_kbest_trees, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_3_genexpr, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_3_genexpr, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_3_genexpr, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_3_kbest_trees, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_3_genexpr, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_3_kbest_trees, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_3_kbest_trees, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_3_genexpr, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_3_genexpr, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_3_kbest_trees, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_3_genexpr, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -17373,7 +20928,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_3_kbest_trees = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_3_kbest_trees, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_3_genexpr, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -17387,60 +20942,44 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_3_kbest_trees = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_4_kbest_features(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_4___get__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__ *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *)o);
-  p->__pyx_v_fmap = 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__ *)o);
   p->__pyx_v_self = 0;
-  p->__pyx_v_size = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_4_kbest_features(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *)o;
-  Py_XDECREF(((PyObject *)p->__pyx_v_fmap));
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_4___get__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__ *)o;
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
-  Py_XDECREF(p->__pyx_v_size);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_4_kbest_features(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_4___get__(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *)o;
-  if (p->__pyx_v_fmap) {
-    e = (*v)(((PyObject*)p->__pyx_v_fmap), a); if (e) return e;
-  }
+  struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__ *)o;
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
-  if (p->__pyx_v_size) {
-    e = (*v)(p->__pyx_v_size, a); if (e) return e;
-  }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_4_kbest_features(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_4___get__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__ *)o;
   PyObject* tmp;
-  tmp = ((PyObject*)p->__pyx_v_fmap);
-  p->__pyx_v_fmap = ((struct __pyx_obj_5_cdec_SparseVector *)Py_None); Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
   tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->__pyx_v_size);
-  p->__pyx_v_size = Py_None; Py_INCREF(Py_None);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_BaseTRule *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_4_kbest_features[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_4___get__[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_4_kbest_features = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_4___get__ = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -17498,7 +21037,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_4_kbest_features =
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_4_kbest_features = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_4___get__ = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -17511,13 +21050,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_4_kbest_feature
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_4_kbest_features = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_4___get__ = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_4_kbest_features = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_4___get__ = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -17538,12 +21077,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_4_kbest_features = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4_kbest_features = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4___get__ = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_4_kbest_features"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_4_kbest_features), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_4___get__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_4___get__), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_4___get__, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -17553,24 +21092,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4_kbest_features = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_4_kbest_features, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_4_kbest_features, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_4_kbest_features, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_4___get__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_4___get__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_4___get__, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_4_kbest_features, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_4___get__, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_4___get__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_4___get__, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_4___get__, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -17580,7 +21119,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4_kbest_features = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_4_kbest_features, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_4___get__, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -17594,44 +21133,44 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_4_kbest_features = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_5_sample(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_5___str__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *)o);
   p->__pyx_v_self = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_5_sample(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_5___str__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *)o;
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_5_sample(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_5___str__(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *)o;
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_5_sample(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_5___str__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_BaseTRule *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_5_sample[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_5___str__[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_5_sample = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_5___str__ = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -17689,7 +21228,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_5_sample = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_5_sample = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_5___str__ = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -17702,13 +21241,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_5_sample = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_5_sample = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_5___str__ = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_5_sample = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_5___str__ = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -17729,12 +21268,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_5_sample = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_5_sample = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_5___str__ = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_5_sample"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_5_sample), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_5___str__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_5_sample, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_5___str__, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -17744,24 +21283,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_5_sample = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_5_sample, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_5_sample, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_5_sample, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_5___str__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_5___str__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_5___str__, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_5_sample, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_5___str__, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_5_sample, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_5_sample, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_5___str__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_5___str__, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_5_sample, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_5___str__, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -17771,7 +21310,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_5_sample = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_5_sample, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_5___str__, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -17785,44 +21324,60 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_5_sample = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_6___get__(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_6_genexpr(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ *)o);
-  p->__pyx_v_self = 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr *)o);
+  p->__pyx_outer_scope = 0;
+  p->__pyx_v_feat = 0;
+  p->__pyx_t_0 = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_6___get__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ *)o;
-  Py_XDECREF(((PyObject *)p->__pyx_v_self));
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_6_genexpr(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_outer_scope));
+  Py_XDECREF(p->__pyx_v_feat);
+  Py_XDECREF(p->__pyx_t_0);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_6___get__(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_6_genexpr(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ *)o;
-  if (p->__pyx_v_self) {
-    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr *)o;
+  if (p->__pyx_outer_scope) {
+    e = (*v)(((PyObject*)p->__pyx_outer_scope), a); if (e) return e;
+  }
+  if (p->__pyx_v_feat) {
+    e = (*v)(p->__pyx_v_feat, a); if (e) return e;
+  }
+  if (p->__pyx_t_0) {
+    e = (*v)(p->__pyx_t_0, a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_6___get__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__ *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_6_genexpr(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr *)o;
   PyObject* tmp;
-  tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_outer_scope);
+  p->__pyx_outer_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_5___str__ *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_feat);
+  p->__pyx_v_feat = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_t_0);
+  p->__pyx_t_0 = Py_None; Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_6___get__[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_6_genexpr[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_6___get__ = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_6_genexpr = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -17880,7 +21435,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_6___get__ = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_6___get__ = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_6_genexpr = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -17893,13 +21448,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_6___get__ = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_6___get__ = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_6_genexpr = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_6___get__ = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_6_genexpr = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -17920,12 +21475,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_6___get__ = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_6___get__ = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_6_genexpr = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_6___get__"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_6___get__), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_6_genexpr"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_6_genexpr), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_6___get__, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_6_genexpr, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -17935,24 +21490,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_6___get__ = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_6___get__, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_6___get__, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_6___get__, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_6_genexpr, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_6_genexpr, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_6_genexpr, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_6___get__, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_6_genexpr, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_6___get__, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_6___get__, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_6_genexpr, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_6_genexpr, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_6___get__, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_6_genexpr, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -17962,7 +21517,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_6___get__ = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_6___get__, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_6_genexpr, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -17976,44 +21531,52 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_6___get__ = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_7___get__(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_7___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__ *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__ *)o);
   p->__pyx_v_self = 0;
+  p->__pyx_v_trule = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_7___get__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_7___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__ *)o;
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  Py_XDECREF(((PyObject *)p->__pyx_v_trule));
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_7___get__(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_7___iter__(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__ *)o;
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
+  if (p->__pyx_v_trule) {
+    e = (*v)(((PyObject*)p->__pyx_v_trule), a); if (e) return e;
+  }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_7___get__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__ *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_7___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Grammar *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_trule);
+  p->__pyx_v_trule = ((struct __pyx_obj_5_cdec_TRule *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_7___get__[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_7___iter__[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_7___get__ = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_7___iter__ = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -18071,7 +21634,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_7___get__ = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_7___get__ = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_7___iter__ = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -18084,13 +21647,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_7___get__ = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_7___get__ = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_7___iter__ = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_7___get__ = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_7___iter__ = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -18111,12 +21674,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_7___get__ = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_7___get__ = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_7___iter__ = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_7___get__"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_7___get__), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_7___iter__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_7___iter__), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_7___get__, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_7___iter__, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -18126,24 +21689,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_7___get__ = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_7___get__, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_7___get__, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_7___get__, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_7___iter__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_7___iter__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_7___iter__, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_7___get__, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_7___iter__, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_7___get__, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_7___get__, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_7___iter__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_7___iter__, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_7___get__, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_7___iter__, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -18153,7 +21716,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_7___get__ = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_7___get__, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_7___iter__, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -18167,44 +21730,52 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_7___get__ = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_8__phrase(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_8_kbest(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *)o);
-  p->__pyx_v_phrase = 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest *)o);
+  p->__pyx_v_self = 0;
+  p->__pyx_v_size = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_8__phrase(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *)o;
-  Py_XDECREF(p->__pyx_v_phrase);
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_8_kbest(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  Py_XDECREF(p->__pyx_v_size);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_8__phrase(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_8_kbest(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *)o;
-  if (p->__pyx_v_phrase) {
-    e = (*v)(p->__pyx_v_phrase, a); if (e) return e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest *)o;
+  if (p->__pyx_v_self) {
+    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  }
+  if (p->__pyx_v_size) {
+    e = (*v)(p->__pyx_v_size, a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_8__phrase(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_8_kbest(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest *)o;
   PyObject* tmp;
-  tmp = ((PyObject*)p->__pyx_v_phrase);
-  p->__pyx_v_phrase = Py_None; Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_v_self);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_size);
+  p->__pyx_v_size = Py_None; Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_8__phrase[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_8_kbest[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_8__phrase = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_8_kbest = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -18262,7 +21833,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_8__phrase = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_8__phrase = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_8_kbest = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -18275,13 +21846,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_8__phrase = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_8__phrase = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_8_kbest = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_8__phrase = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_8_kbest = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -18302,12 +21873,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_8__phrase = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_8__phrase = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_8_kbest = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_8__phrase"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_8_kbest"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_8_kbest), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_8__phrase, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_8_kbest, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -18317,24 +21888,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_8__phrase = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_8__phrase, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_8__phrase, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_8__phrase, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_8_kbest, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_8_kbest, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_8_kbest, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_8__phrase, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_8_kbest, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_8__phrase, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_8__phrase, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_8_kbest, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_8_kbest, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_8__phrase, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_8_kbest, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -18344,7 +21915,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_8__phrase = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_8__phrase, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_8_kbest, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -18358,60 +21929,68 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_8__phrase = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_9_genexpr(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_9_kbest_trees(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr *)o);
-  p->__pyx_outer_scope = 0;
-  p->__pyx_v_w = 0;
-  p->__pyx_t_0 = 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees *)o);
+  p->__pyx_v_e_tree = 0;
+  p->__pyx_v_f_tree = 0;
+  p->__pyx_v_self = 0;
+  p->__pyx_v_size = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_9_genexpr(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr *)o;
-  Py_XDECREF(((PyObject *)p->__pyx_outer_scope));
-  Py_XDECREF(p->__pyx_v_w);
-  Py_XDECREF(p->__pyx_t_0);
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_9_kbest_trees(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_v_e_tree));
+  Py_XDECREF(((PyObject *)p->__pyx_v_f_tree));
+  Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  Py_XDECREF(p->__pyx_v_size);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_9_genexpr(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_9_kbest_trees(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr *)o;
-  if (p->__pyx_outer_scope) {
-    e = (*v)(((PyObject*)p->__pyx_outer_scope), a); if (e) return e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees *)o;
+  if (p->__pyx_v_e_tree) {
+    e = (*v)(p->__pyx_v_e_tree, a); if (e) return e;
   }
-  if (p->__pyx_v_w) {
-    e = (*v)(p->__pyx_v_w, a); if (e) return e;
+  if (p->__pyx_v_f_tree) {
+    e = (*v)(p->__pyx_v_f_tree, a); if (e) return e;
   }
-  if (p->__pyx_t_0) {
-    e = (*v)(p->__pyx_t_0, a); if (e) return e;
+  if (p->__pyx_v_self) {
+    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  }
+  if (p->__pyx_v_size) {
+    e = (*v)(p->__pyx_v_size, a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_9_genexpr(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_9_kbest_trees(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees *)o;
   PyObject* tmp;
-  tmp = ((PyObject*)p->__pyx_outer_scope);
-  p->__pyx_outer_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_8__phrase *)Py_None); Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_v_e_tree);
+  p->__pyx_v_e_tree = ((PyObject*)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->__pyx_v_w);
-  p->__pyx_v_w = Py_None; Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_v_f_tree);
+  p->__pyx_v_f_tree = ((PyObject*)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->__pyx_t_0);
-  p->__pyx_t_0 = Py_None; Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_v_self);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_size);
+  p->__pyx_v_size = Py_None; Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_9_genexpr[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_9_kbest_trees[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_9_genexpr = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_9_kbest_trees = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -18469,7 +22048,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_9_genexpr = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_9_genexpr = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_9_kbest_trees = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -18482,13 +22061,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_9_genexpr = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_9_genexpr = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_9_kbest_trees = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_9_genexpr = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_9_kbest_trees = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -18509,12 +22088,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_9_genexpr = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_9_genexpr = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_9_kbest_trees = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_9_genexpr"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_9_genexpr), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_9_kbest_trees"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_9_kbest_trees), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_9_genexpr, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_9_kbest_trees, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -18524,24 +22103,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_9_genexpr = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_9_genexpr, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_9_genexpr, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_9_genexpr, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_9_kbest_trees, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_9_kbest_trees, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_9_kbest_trees, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_9_genexpr, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_9_kbest_trees, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_9_genexpr, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_9_genexpr, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_9_kbest_trees, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_9_kbest_trees, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_9_genexpr, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_9_kbest_trees, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -18551,7 +22130,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_9_genexpr = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_9_genexpr, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_9_kbest_trees, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -18565,44 +22144,60 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_9_genexpr = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_10___str__(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_10_kbest_features(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features *)o);
+  p->__pyx_v_fmap = 0;
   p->__pyx_v_self = 0;
+  p->__pyx_v_size = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_10___str__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_10_kbest_features(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_v_fmap));
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  Py_XDECREF(p->__pyx_v_size);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_10___str__(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_10_kbest_features(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features *)o;
+  if (p->__pyx_v_fmap) {
+    e = (*v)(((PyObject*)p->__pyx_v_fmap), a); if (e) return e;
+  }
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
+  if (p->__pyx_v_size) {
+    e = (*v)(p->__pyx_v_size, a); if (e) return e;
+  }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_10___str__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_10_kbest_features(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features *)o;
   PyObject* tmp;
+  tmp = ((PyObject*)p->__pyx_v_fmap);
+  p->__pyx_v_fmap = ((struct __pyx_obj_5_cdec_SparseVector *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
   tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_TRule *)Py_None); Py_INCREF(Py_None);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->__pyx_v_size);
+  p->__pyx_v_size = Py_None; Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_10___str__[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_10_kbest_features[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_10___str__ = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_10_kbest_features = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -18660,7 +22255,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_10___str__ = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_10___str__ = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_10_kbest_features = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -18673,13 +22268,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_10___str__ = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_10___str__ = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_10_kbest_features = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_10___str__ = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_10_kbest_features = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -18700,12 +22295,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_10___str__ = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_10___str__ = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_10_kbest_features = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_10___str__"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_10_kbest_features"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_10_kbest_features), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_10___str__, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_10_kbest_features, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -18715,24 +22310,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_10___str__ = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_10___str__, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_10___str__, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_10___str__, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_10_kbest_features, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_10_kbest_features, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_10_kbest_features, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_10___str__, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_10_kbest_features, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_10___str__, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_10___str__, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_10_kbest_features, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_10_kbest_features, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_10___str__, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_10_kbest_features, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -18742,7 +22337,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_10___str__ = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_10___str__, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_10_kbest_features, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -18756,60 +22351,44 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_10___str__ = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_11_genexpr(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_11_sample(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr *)o);
-  p->__pyx_outer_scope = 0;
-  p->__pyx_v_feat = 0;
-  p->__pyx_t_0 = 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *)o);
+  p->__pyx_v_self = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_11_genexpr(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr *)o;
-  Py_XDECREF(((PyObject *)p->__pyx_outer_scope));
-  Py_XDECREF(p->__pyx_v_feat);
-  Py_XDECREF(p->__pyx_t_0);
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_11_sample(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_v_self));
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_11_genexpr(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_11_sample(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr *)o;
-  if (p->__pyx_outer_scope) {
-    e = (*v)(((PyObject*)p->__pyx_outer_scope), a); if (e) return e;
-  }
-  if (p->__pyx_v_feat) {
-    e = (*v)(p->__pyx_v_feat, a); if (e) return e;
-  }
-  if (p->__pyx_t_0) {
-    e = (*v)(p->__pyx_t_0, a); if (e) return e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *)o;
+  if (p->__pyx_v_self) {
+    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_11_genexpr(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_11_sample(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample *)o;
   PyObject* tmp;
-  tmp = ((PyObject*)p->__pyx_outer_scope);
-  p->__pyx_outer_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_10___str__ *)Py_None); Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->__pyx_v_feat);
-  p->__pyx_v_feat = Py_None; Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->__pyx_t_0);
-  p->__pyx_t_0 = Py_None; Py_INCREF(Py_None);
+  tmp = ((PyObject*)p->__pyx_v_self);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_11_genexpr[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_11_sample[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_11_genexpr = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_11_sample = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -18867,7 +22446,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_11_genexpr = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_11_genexpr = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_11_sample = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -18880,13 +22459,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_11_genexpr = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_11_genexpr = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_11_sample = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_11_genexpr = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_11_sample = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -18907,12 +22486,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_11_genexpr = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_11_genexpr = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_11_sample = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_11_genexpr"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_11_genexpr), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_11_sample"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_11_sample), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_11_genexpr, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_11_sample, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -18922,24 +22501,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_11_genexpr = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_11_genexpr, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_11_genexpr, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_11_genexpr, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_11_sample, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_11_sample, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_11_sample, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_11_genexpr, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_11_sample, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_11_genexpr, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_11_genexpr, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_11_sample, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_11_sample, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_11_genexpr, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_11_sample, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -18949,7 +22528,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_11_genexpr = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_11_genexpr, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_11_sample, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -18991,7 +22570,7 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_12___get__(PyObject *o) {
   struct __pyx_obj_5_cdec___pyx_scope_struct_12___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_12___get__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_HypergraphEdge *)Py_None); Py_INCREF(Py_None);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
@@ -19182,7 +22761,7 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_13___get__(PyObject *o) {
   struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_13___get__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_HypergraphNode *)Py_None); Py_INCREF(Py_None);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Hypergraph *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
@@ -19373,7 +22952,7 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_14___get__(PyObject *o) {
   struct __pyx_obj_5_cdec___pyx_scope_struct_14___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_14___get__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
-  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_HypergraphNode *)Py_None); Py_INCREF(Py_None);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_HypergraphEdge *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   return 0;
 }
@@ -19536,32 +23115,414 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_14___get__ = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_15___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__ *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_15___get__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__ *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *)o);
   p->__pyx_v_self = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_15___iter__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__ *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_15___get__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *)o;
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_15___iter__(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_15___get__(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__ *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *)o;
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_15___iter__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__ *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_15___get__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__ *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->__pyx_v_self);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_HypergraphNode *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_15___get__[] = {
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_15___get__ = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_15___get__ = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_15___get__ = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_15___get__ = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_15___get__ = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_15___get__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_15___get__), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_15___get__, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number___pyx_scope_struct_15___get__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_15___get__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_15___get__, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_15___get__, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_15___get__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_15___get__, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec___pyx_scope_struct_15___get__, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_15___get__, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_16___get__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *)o);
+  p->__pyx_v_self = 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_16___get__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_16___get__(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *)o;
+  if (p->__pyx_v_self) {
+    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_16___get__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__ *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->__pyx_v_self);
+  p->__pyx_v_self = ((struct __pyx_obj_5_cdec_HypergraphNode *)Py_None); Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_16___get__[] = {
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_16___get__ = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_long*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if PY_VERSION_HEX >= 0x02050000
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_16___get__ = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_16___get__ = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_16___get__ = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_16___get__ = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_16___get__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_16___get__), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_16___get__, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*tp_compare*/
+  #else
+  0, /*reserved*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number___pyx_scope_struct_16___get__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_16___get__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_16___get__, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_16___get__, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_16___get__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_16___get__, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_5_cdec___pyx_scope_struct_16___get__, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_16___get__, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_17___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__ *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__ *)o);
+  p->__pyx_v_self = 0;
+  return o;
+}
+
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_17___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__ *)o;
+  Py_XDECREF(((PyObject *)p->__pyx_v_self));
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_17___iter__(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__ *)o;
+  if (p->__pyx_v_self) {
+    e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_17___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
   p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Lattice *)Py_None); Py_INCREF(Py_None);
@@ -19569,11 +23530,11 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_15___iter__(PyObject *o) {
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_15___iter__[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_17___iter__[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_15___iter__ = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_17___iter__ = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -19631,7 +23592,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_15___iter__ = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_15___iter__ = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_17___iter__ = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -19644,13 +23605,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_15___iter__ = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_15___iter__ = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_17___iter__ = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_15___iter__ = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_17___iter__ = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -19671,12 +23632,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_15___iter__ = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_15___iter__ = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_17___iter__ = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_15___iter__"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_15___iter__), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_17___iter__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_17___iter__), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_15___iter__, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_17___iter__, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -19686,24 +23647,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_15___iter__ = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_15___iter__, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_15___iter__, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_15___iter__, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_17___iter__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_17___iter__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_17___iter__, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_15___iter__, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_17___iter__, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_15___iter__, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_15___iter__, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_17___iter__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_17___iter__, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_15___iter__, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_17___iter__, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -19713,7 +23674,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_15___iter__ = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_15___iter__, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_17___iter__, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -19727,32 +23688,32 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_15___iter__ = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_16_todot(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_18_todot(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *)o);
   p->__pyx_v_self = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_16_todot(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_18_todot(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *)o;
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_16_todot(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_18_todot(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *)o;
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_16_todot(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_18_todot(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
   p->__pyx_v_self = ((struct __pyx_obj_5_cdec_Lattice *)Py_None); Py_INCREF(Py_None);
@@ -19760,11 +23721,11 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_16_todot(PyObject *o) {
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_16_todot[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_18_todot[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_16_todot = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_18_todot = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -19822,7 +23783,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_16_todot = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_16_todot = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_18_todot = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -19835,13 +23796,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_16_todot = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_16_todot = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_18_todot = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_16_todot = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_18_todot = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -19862,12 +23823,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_16_todot = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_16_todot = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_18_todot = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_16_todot"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_18_todot"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_16_todot, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_18_todot, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -19877,24 +23838,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_16_todot = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_16_todot, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_16_todot, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_16_todot, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_18_todot, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_18_todot, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_18_todot, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_16_todot, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_18_todot, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_16_todot, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_16_todot, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_18_todot, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_18_todot, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_16_todot, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_18_todot, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -19904,7 +23865,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_16_todot = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_16_todot, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_18_todot, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -19918,11 +23879,11 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_16_todot = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_17_lines(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_19_lines(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines *)o);
   p->__pyx_outer_scope = 0;
   p->__pyx_v_delta = 0;
   p->__pyx_v_i = 0;
@@ -19933,8 +23894,8 @@ static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_17_lines(PyTypeObject *t
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_17_lines(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_19_lines(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines *)o;
   Py_XDECREF(((PyObject *)p->__pyx_outer_scope));
   Py_XDECREF(p->__pyx_v_delta);
   Py_XDECREF(p->__pyx_v_i);
@@ -19945,9 +23906,9 @@ static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_17_lines(PyObject *o) {
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_17_lines(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_19_lines(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines *)o;
   if (p->__pyx_outer_scope) {
     e = (*v)(((PyObject*)p->__pyx_outer_scope), a); if (e) return e;
   }
@@ -19972,11 +23933,11 @@ static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_17_lines(PyObject *o, vis
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_17_lines(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_19_lines(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_outer_scope);
-  p->__pyx_outer_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_16_todot *)Py_None); Py_INCREF(Py_None);
+  p->__pyx_outer_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_18_todot *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   tmp = ((PyObject*)p->__pyx_v_delta);
   p->__pyx_v_delta = Py_None; Py_INCREF(Py_None);
@@ -19999,11 +23960,11 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_17_lines(PyObject *o) {
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_17_lines[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_19_lines[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_17_lines = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_19_lines = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -20061,7 +24022,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_17_lines = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_17_lines = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_19_lines = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -20074,13 +24035,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_17_lines = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_17_lines = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_19_lines = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_17_lines = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_19_lines = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -20101,12 +24062,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_17_lines = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_17_lines = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_19_lines = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_17_lines"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_17_lines), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_19_lines"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_19_lines), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_17_lines, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_19_lines, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -20116,24 +24077,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_17_lines = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_17_lines, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_17_lines, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_17_lines, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_19_lines, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_19_lines, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_19_lines, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_17_lines, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_19_lines, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_17_lines, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_17_lines, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_19_lines, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_19_lines, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_17_lines, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_19_lines, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -20143,7 +24104,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_17_lines = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_17_lines, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_19_lines, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -20157,28 +24118,28 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_17_lines = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_18___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__ *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_20___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__ *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__ *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__ *)o);
   p->__pyx_v_i = 0;
   p->__pyx_v_self = 0;
   p->__pyx_t_1 = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_18___iter__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__ *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_20___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__ *)o;
   Py_XDECREF(p->__pyx_v_i);
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
   Py_XDECREF(p->__pyx_t_1);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_18___iter__(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_20___iter__(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__ *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__ *)o;
   if (p->__pyx_v_i) {
     e = (*v)(p->__pyx_v_i, a); if (e) return e;
   }
@@ -20191,8 +24152,8 @@ static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_18___iter__(PyObject *o,
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_18___iter__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__ *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_20___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_i);
   p->__pyx_v_i = Py_None; Py_INCREF(Py_None);
@@ -20206,11 +24167,11 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_18___iter__(PyObject *o) {
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_18___iter__[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_20___iter__[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_18___iter__ = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_20___iter__ = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -20268,7 +24229,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_18___iter__ = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_18___iter__ = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_20___iter__ = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -20281,13 +24242,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_18___iter__ = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_18___iter__ = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_20___iter__ = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_18___iter__ = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_20___iter__ = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -20308,12 +24269,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_18___iter__ = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_18___iter__ = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_20___iter__ = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_18___iter__"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_18___iter__), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_20___iter__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_20___iter__), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_18___iter__, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_20___iter__, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -20323,24 +24284,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_18___iter__ = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_18___iter__, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_18___iter__, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_18___iter__, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_20___iter__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_20___iter__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_20___iter__, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_18___iter__, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_20___iter__, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_18___iter__, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_18___iter__, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_20___iter__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_20___iter__, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_18___iter__, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_20___iter__, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -20350,7 +24311,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_18___iter__ = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_18___iter__, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_20___iter__, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -20364,32 +24325,32 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_18___iter__ = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_19___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__ *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_21___iter__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__ *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__ *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__ *)o);
   p->__pyx_v_self = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_19___iter__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__ *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_21___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__ *)o;
   Py_XDECREF(((PyObject *)p->__pyx_v_self));
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_19___iter__(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_21___iter__(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__ *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__ *)o;
   if (p->__pyx_v_self) {
     e = (*v)(((PyObject*)p->__pyx_v_self), a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_19___iter__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__ *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_21___iter__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_self);
   p->__pyx_v_self = ((struct __pyx_obj_5_cdec_CandidateSet *)Py_None); Py_INCREF(Py_None);
@@ -20397,11 +24358,11 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_19___iter__(PyObject *o) {
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_19___iter__[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_21___iter__[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_19___iter__ = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_21___iter__ = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -20459,7 +24420,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_19___iter__ = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_19___iter__ = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_21___iter__ = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -20472,13 +24433,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_19___iter__ = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_19___iter__ = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_21___iter__ = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_19___iter__ = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_21___iter__ = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -20499,12 +24460,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_19___iter__ = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_19___iter__ = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_21___iter__ = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_19___iter__"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_19___iter__), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_21___iter__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_21___iter__), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_19___iter__, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_21___iter__, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -20514,24 +24475,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_19___iter__ = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_19___iter__, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_19___iter__, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_19___iter__, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_21___iter__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_21___iter__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_21___iter__, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_19___iter__, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_21___iter__, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_19___iter__, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_19___iter__, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_21___iter__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_21___iter__, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_19___iter__, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_21___iter__, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -20541,7 +24502,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_19___iter__ = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_19___iter__, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_21___iter__, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -20555,11 +24516,11 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_19___iter__ = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_20__make_config(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_22__make_config(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config *)o);
   p->__pyx_v_config = 0;
   p->__pyx_v_info = 0;
   p->__pyx_v_key = 0;
@@ -20570,8 +24531,8 @@ static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_20__make_config(PyTypeOb
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_20__make_config(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_22__make_config(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config *)o;
   Py_XDECREF(p->__pyx_v_config);
   Py_XDECREF(p->__pyx_v_info);
   Py_XDECREF(p->__pyx_v_key);
@@ -20582,9 +24543,9 @@ static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_20__make_config(PyObject
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_20__make_config(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_22__make_config(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config *)o;
   if (p->__pyx_v_config) {
     e = (*v)(p->__pyx_v_config, a); if (e) return e;
   }
@@ -20609,8 +24570,8 @@ static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_20__make_config(PyObject
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_20__make_config(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_22__make_config(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_config);
   p->__pyx_v_config = Py_None; Py_INCREF(Py_None);
@@ -20636,11 +24597,11 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_20__make_config(PyObject *o)
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_20__make_config[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_22__make_config[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_20__make_config = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_22__make_config = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -20698,7 +24659,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_20__make_config = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_20__make_config = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_22__make_config = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -20711,13 +24672,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_20__make_config
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_20__make_config = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_22__make_config = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_20__make_config = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_22__make_config = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -20738,12 +24699,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_20__make_config = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_20__make_config = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_22__make_config = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_20__make_config"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_20__make_config), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_22__make_config"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_22__make_config), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_20__make_config, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_22__make_config, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -20753,24 +24714,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_20__make_config = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_20__make_config, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_20__make_config, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_20__make_config, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_22__make_config, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_22__make_config, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_22__make_config, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_20__make_config, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_22__make_config, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_20__make_config, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_20__make_config, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_22__make_config, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_22__make_config, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_20__make_config, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_22__make_config, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -20780,7 +24741,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_20__make_config = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_20__make_config, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_22__make_config, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -20794,32 +24755,32 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_20__make_config = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_21___cinit__(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_23___cinit__(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *)o);
   p->__pyx_v_config = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_21___cinit__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_23___cinit__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *)o;
   Py_XDECREF(p->__pyx_v_config);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_21___cinit__(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_23___cinit__(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *)o;
   if (p->__pyx_v_config) {
     e = (*v)(p->__pyx_v_config, a); if (e) return e;
   }
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_21___cinit__(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_23___cinit__(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_v_config);
   p->__pyx_v_config = Py_None; Py_INCREF(Py_None);
@@ -20827,11 +24788,11 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_21___cinit__(PyObject *o) {
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_21___cinit__[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_23___cinit__[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_21___cinit__ = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_23___cinit__ = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -20889,7 +24850,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_21___cinit__ = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_21___cinit__ = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_23___cinit__ = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -20902,13 +24863,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_21___cinit__ =
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_21___cinit__ = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_23___cinit__ = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_21___cinit__ = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_23___cinit__ = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -20929,12 +24890,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_21___cinit__ = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_21___cinit__ = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_23___cinit__ = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_21___cinit__"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_23___cinit__"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_21___cinit__, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_23___cinit__, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -20944,24 +24905,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_21___cinit__ = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_21___cinit__, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_21___cinit__, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_21___cinit__, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_23___cinit__, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_23___cinit__, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_23___cinit__, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_21___cinit__, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_23___cinit__, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_21___cinit__, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_21___cinit__, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_23___cinit__, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_23___cinit__, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_21___cinit__, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_23___cinit__, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -20971,7 +24932,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_21___cinit__ = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_21___cinit__, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_23___cinit__, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
@@ -20985,28 +24946,28 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_21___cinit__ = {
   #endif
 };
 
-static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_22_genexpr(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr *p;
+static PyObject *__pyx_tp_new_5_cdec___pyx_scope_struct_24_genexpr(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *p;
   PyObject *o = (*t->tp_alloc)(t, 0);
   if (!o) return 0;
-  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr *)o);
+  p = ((struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *)o);
   p->__pyx_outer_scope = 0;
   p->__pyx_v_kv = 0;
   p->__pyx_t_0 = 0;
   return o;
 }
 
-static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_22_genexpr(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr *)o;
+static void __pyx_tp_dealloc_5_cdec___pyx_scope_struct_24_genexpr(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *)o;
   Py_XDECREF(((PyObject *)p->__pyx_outer_scope));
   Py_XDECREF(p->__pyx_v_kv);
   Py_XDECREF(p->__pyx_t_0);
   (*Py_TYPE(o)->tp_free)(o);
 }
 
-static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_22_genexpr(PyObject *o, visitproc v, void *a) {
+static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_24_genexpr(PyObject *o, visitproc v, void *a) {
   int e;
-  struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr *)o;
+  struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *)o;
   if (p->__pyx_outer_scope) {
     e = (*v)(((PyObject*)p->__pyx_outer_scope), a); if (e) return e;
   }
@@ -21019,11 +24980,11 @@ static int __pyx_tp_traverse_5_cdec___pyx_scope_struct_22_genexpr(PyObject *o, v
   return 0;
 }
 
-static int __pyx_tp_clear_5_cdec___pyx_scope_struct_22_genexpr(PyObject *o) {
-  struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr *)o;
+static int __pyx_tp_clear_5_cdec___pyx_scope_struct_24_genexpr(PyObject *o) {
+  struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *p = (struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr *)o;
   PyObject* tmp;
   tmp = ((PyObject*)p->__pyx_outer_scope);
-  p->__pyx_outer_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_21___cinit__ *)Py_None); Py_INCREF(Py_None);
+  p->__pyx_outer_scope = ((struct __pyx_obj_5_cdec___pyx_scope_struct_23___cinit__ *)Py_None); Py_INCREF(Py_None);
   Py_XDECREF(tmp);
   tmp = ((PyObject*)p->__pyx_v_kv);
   p->__pyx_v_kv = Py_None; Py_INCREF(Py_None);
@@ -21034,11 +24995,11 @@ static int __pyx_tp_clear_5_cdec___pyx_scope_struct_22_genexpr(PyObject *o) {
   return 0;
 }
 
-static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_22_genexpr[] = {
+static PyMethodDef __pyx_methods_5_cdec___pyx_scope_struct_24_genexpr[] = {
   {0, 0, 0, 0}
 };
 
-static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_22_genexpr = {
+static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_24_genexpr = {
   0, /*nb_add*/
   0, /*nb_subtract*/
   0, /*nb_multiply*/
@@ -21096,7 +25057,7 @@ static PyNumberMethods __pyx_tp_as_number___pyx_scope_struct_22_genexpr = {
   #endif
 };
 
-static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_22_genexpr = {
+static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_24_genexpr = {
   0, /*sq_length*/
   0, /*sq_concat*/
   0, /*sq_repeat*/
@@ -21109,13 +25070,13 @@ static PySequenceMethods __pyx_tp_as_sequence___pyx_scope_struct_22_genexpr = {
   0, /*sq_inplace_repeat*/
 };
 
-static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_22_genexpr = {
+static PyMappingMethods __pyx_tp_as_mapping___pyx_scope_struct_24_genexpr = {
   0, /*mp_length*/
   0, /*mp_subscript*/
   0, /*mp_ass_subscript*/
 };
 
-static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_22_genexpr = {
+static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_24_genexpr = {
   #if PY_MAJOR_VERSION < 3
   0, /*bf_getreadbuffer*/
   #endif
@@ -21136,12 +25097,12 @@ static PyBufferProcs __pyx_tp_as_buffer___pyx_scope_struct_22_genexpr = {
   #endif
 };
 
-static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_22_genexpr = {
+static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_24_genexpr = {
   PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_22_genexpr"), /*tp_name*/
-  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_22_genexpr), /*tp_basicsize*/
+  __Pyx_NAMESTR("_cdec.__pyx_scope_struct_24_genexpr"), /*tp_name*/
+  sizeof(struct __pyx_obj_5_cdec___pyx_scope_struct_24_genexpr), /*tp_basicsize*/
   0, /*tp_itemsize*/
-  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_22_genexpr, /*tp_dealloc*/
+  __pyx_tp_dealloc_5_cdec___pyx_scope_struct_24_genexpr, /*tp_dealloc*/
   0, /*tp_print*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
@@ -21151,24 +25112,24 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_22_genexpr = {
   0, /*reserved*/
   #endif
   0, /*tp_repr*/
-  &__pyx_tp_as_number___pyx_scope_struct_22_genexpr, /*tp_as_number*/
-  &__pyx_tp_as_sequence___pyx_scope_struct_22_genexpr, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping___pyx_scope_struct_22_genexpr, /*tp_as_mapping*/
+  &__pyx_tp_as_number___pyx_scope_struct_24_genexpr, /*tp_as_number*/
+  &__pyx_tp_as_sequence___pyx_scope_struct_24_genexpr, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping___pyx_scope_struct_24_genexpr, /*tp_as_mapping*/
   0, /*tp_hash*/
   0, /*tp_call*/
   0, /*tp_str*/
   0, /*tp_getattro*/
   0, /*tp_setattro*/
-  &__pyx_tp_as_buffer___pyx_scope_struct_22_genexpr, /*tp_as_buffer*/
+  &__pyx_tp_as_buffer___pyx_scope_struct_24_genexpr, /*tp_as_buffer*/
   Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
   0, /*tp_doc*/
-  __pyx_tp_traverse_5_cdec___pyx_scope_struct_22_genexpr, /*tp_traverse*/
-  __pyx_tp_clear_5_cdec___pyx_scope_struct_22_genexpr, /*tp_clear*/
+  __pyx_tp_traverse_5_cdec___pyx_scope_struct_24_genexpr, /*tp_traverse*/
+  __pyx_tp_clear_5_cdec___pyx_scope_struct_24_genexpr, /*tp_clear*/
   0, /*tp_richcompare*/
   0, /*tp_weaklistoffset*/
   0, /*tp_iter*/
   0, /*tp_iternext*/
-  __pyx_methods_5_cdec___pyx_scope_struct_22_genexpr, /*tp_methods*/
+  __pyx_methods_5_cdec___pyx_scope_struct_24_genexpr, /*tp_methods*/
   0, /*tp_members*/
   0, /*tp_getset*/
   0, /*tp_base*/
@@ -21178,7 +25139,7 @@ static PyTypeObject __pyx_type_5_cdec___pyx_scope_struct_22_genexpr = {
   0, /*tp_dictoffset*/
   0, /*tp_init*/
   0, /*tp_alloc*/
-  __pyx_tp_new_5_cdec___pyx_scope_struct_22_genexpr, /*tp_new*/
+  __pyx_tp_new_5_cdec___pyx_scope_struct_24_genexpr, /*tp_new*/
   0, /*tp_free*/
   0, /*tp_is_gc*/
   0, /*tp_bases*/
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   {&__pyx_kp_s_13, __pyx_k_13, sizeof(__pyx_k_13), 0, 0, 1, 0},
-  {&__pyx_kp_s_15, __pyx_k_15, sizeof(__pyx_k_15), 0, 0, 1, 0},
-  {&__pyx_kp_s_18, __pyx_k_18, sizeof(__pyx_k_18), 0, 0, 1, 0},
+  {&__pyx_n_s_15, __pyx_k_15, sizeof(__pyx_k_15), 0, 0, 1, 1},
+  {&__pyx_kp_s_16, __pyx_k_16, sizeof(__pyx_k_16), 0, 0, 1, 0},
+  {&__pyx_kp_s_17, __pyx_k_17, sizeof(__pyx_k_17), 0, 0, 1, 0},
   {&__pyx_kp_s_19, __pyx_k_19, sizeof(__pyx_k_19), 0, 0, 1, 0},
+  {&__pyx_kp_s_22, __pyx_k_22, sizeof(__pyx_k_22), 0, 0, 1, 0},
   {&__pyx_kp_s_23, __pyx_k_23, sizeof(__pyx_k_23), 0, 0, 1, 0},
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-  {&__pyx_kp_s_25, __pyx_k_25, sizeof(__pyx_k_25), 0, 0, 1, 0},
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   {&__pyx_kp_s_28, __pyx_k_28, sizeof(__pyx_k_28), 0, 0, 1, 0},
+  {&__pyx_kp_s_29, __pyx_k_29, sizeof(__pyx_k_29), 0, 0, 1, 0},
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   {&__pyx_kp_s_31, __pyx_k_31, sizeof(__pyx_k_31), 0, 0, 1, 0},
+  {&__pyx_kp_s_32, __pyx_k_32, sizeof(__pyx_k_32), 0, 0, 1, 0},
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   {&__pyx_kp_s_35, __pyx_k_35, sizeof(__pyx_k_35), 0, 0, 1, 0},
-  {&__pyx_kp_s_37, __pyx_k_37, sizeof(__pyx_k_37), 0, 0, 1, 0},
+  {&__pyx_kp_s_38, __pyx_k_38, sizeof(__pyx_k_38), 0, 0, 1, 0},
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-  {&__pyx_kp_s_42, __pyx_k_42, sizeof(__pyx_k_42), 0, 0, 1, 0},
+  {&__pyx_kp_s_41, __pyx_k_41, sizeof(__pyx_k_41), 0, 0, 1, 0},
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   {&__pyx_kp_s_44, __pyx_k_44, sizeof(__pyx_k_44), 0, 0, 1, 0},
+  {&__pyx_kp_s_46, __pyx_k_46, sizeof(__pyx_k_46), 0, 0, 1, 0},
+  {&__pyx_kp_s_47, __pyx_k_47, sizeof(__pyx_k_47), 0, 0, 1, 0},
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-  {&__pyx_kp_s_56, __pyx_k_56, sizeof(__pyx_k_56), 0, 0, 1, 0},
-  {&__pyx_n_s_6, __pyx_k_6, sizeof(__pyx_k_6), 0, 0, 1, 1},
+  {&__pyx_kp_s_54, __pyx_k_54, sizeof(__pyx_k_54), 0, 0, 1, 0},
+  {&__pyx_kp_s_59, __pyx_k_59, sizeof(__pyx_k_59), 0, 0, 1, 0},
   {&__pyx_kp_s_7, __pyx_k_7, sizeof(__pyx_k_7), 0, 0, 1, 0},
   {&__pyx_kp_s_8, __pyx_k_8, sizeof(__pyx_k_8), 0, 0, 1, 0},
+  {&__pyx_kp_s_9, __pyx_k_9, sizeof(__pyx_k_9), 0, 0, 1, 0},
   {&__pyx_n_s__BLEU, __pyx_k__BLEU, sizeof(__pyx_k__BLEU), 0, 0, 1, 1},
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   {&__pyx_n_s__IBM_BLEU, __pyx_k__IBM_BLEU, sizeof(__pyx_k__IBM_BLEU), 0, 0, 1, 1},
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   {&__pyx_n_s__TypeError, __pyx_k__TypeError, sizeof(__pyx_k__TypeError), 0, 0, 1, 1},
+  {&__pyx_n_s__ValueError, __pyx_k__ValueError, sizeof(__pyx_k__ValueError), 0, 0, 1, 1},
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   {&__pyx_n_s___phrase, __pyx_k___phrase, sizeof(__pyx_k___phrase), 0, 0, 1, 1},
+  {&__pyx_n_s__a, __pyx_k__a, sizeof(__pyx_k__a), 0, 0, 1, 1},
   {&__pyx_n_s__beam_alpha, __pyx_k__beam_alpha, sizeof(__pyx_k__beam_alpha), 0, 0, 1, 1},
+  {&__pyx_n_s__cat, __pyx_k__cat, sizeof(__pyx_k__cat), 0, 0, 1, 1},
   {&__pyx_n_s__config, __pyx_k__config, sizeof(__pyx_k__config), 0, 0, 1, 1},
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   {&__pyx_n_s__range, __pyx_k__range, sizeof(__pyx_k__range), 0, 0, 1, 1},
+  {&__pyx_n_s__ref, __pyx_k__ref, sizeof(__pyx_k__ref), 0, 0, 1, 1},
   {&__pyx_n_s__refs, __pyx_k__refs, sizeof(__pyx_k__refs), 0, 0, 1, 1},
   {&__pyx_n_s__replace, __pyx_k__replace, sizeof(__pyx_k__replace), 0, 0, 1, 1},
+  {&__pyx_n_s__rules, __pyx_k__rules, sizeof(__pyx_k__rules), 0, 0, 1, 1},
   {&__pyx_n_s__scfg, __pyx_k__scfg, sizeof(__pyx_k__scfg), 0, 0, 1, 1},
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   {&__pyx_n_s__self, __pyx_k__self, sizeof(__pyx_k__self), 0, 0, 1, 1},
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 };
 static int __Pyx_InitCachedBuiltins(void) {
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+  __pyx_builtin_Exception = __Pyx_GetName(__pyx_b, __pyx_n_s__Exception); if (!__pyx_builtin_Exception) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_builtin_NotImplemented = __Pyx_GetName(__pyx_b, __pyx_n_s__NotImplemented); if (!__pyx_builtin_NotImplemented) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_builtin_ValueError = __Pyx_GetName(__pyx_b, __pyx_n_s__ValueError); if (!__pyx_builtin_ValueError) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 175; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_builtin_eval = __Pyx_GetName(__pyx_b, __pyx_n_s__eval); if (!__pyx_builtin_eval) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 102; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_builtin_enumerate = __Pyx_GetName(__pyx_b, __pyx_n_s__enumerate); if (!__pyx_builtin_enumerate) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 9; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_builtin_IndexError = __Pyx_GetName(__pyx_b, __pyx_n_s__IndexError); if (!__pyx_builtin_IndexError) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 21; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_builtin_open = __Pyx_GetName(__pyx_b, __pyx_n_s__open); if (!__pyx_builtin_open) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 86; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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- *     if isinstance(sentence, unicode):
- *         ret = sentence.encode('utf8')             # <<<<<<<<<<<<<<
- *     elif isinstance(sentence, str):
- *         ret = sentence
+ *     if isinstance(data, unicode):
+ *         ret = data.encode('utf8')             # <<<<<<<<<<<<<<
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+ *         ret = data
  */
   __pyx_k_tuple_2 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 9; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_2));
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":76
+  /* "/Users/vchahun/Sandbox/cdec/python/src/vectors.pxi":77
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+  __pyx_k_tuple_5 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_5)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_5));
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/trule.pxi":2
+  /* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":4
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+ *     return ' '.join(w.encode('utf8') if isinstance(w, unicode) else str(w) for w in phrase)             # <<<<<<<<<<<<<<
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- * cdef class TRule:
+ * cdef class NT:
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-  __pyx_k_tuple_9 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_9)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 2; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __Pyx_GOTREF(__pyx_k_tuple_9);
+  __pyx_k_tuple_6 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_6)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   __Pyx_INCREF(((PyObject *)__pyx_n_s__utf8));
-  PyTuple_SET_ITEM(__pyx_k_tuple_9, 0, ((PyObject *)__pyx_n_s__utf8));
+  PyTuple_SET_ITEM(__pyx_k_tuple_6, 0, ((PyObject *)__pyx_n_s__utf8));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__utf8));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_9));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_6));
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":177
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- *             return not (x == y)
- *         raise NotImplemented('comparison not implemented for HypergraphEdge')             # <<<<<<<<<<<<<<
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- * cdef class HypergraphNode:
+  /* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":175
+ *         for trule in rules:
+ *             if not isinstance(trule, BaseTRule):
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+  __pyx_k_tuple_14 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_14)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 175; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_14));
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":214
+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":191
+ *         elif op == 3: # !=
+ *             return not (x == y)
+ *         raise NotImplemented('comparison not implemented for HypergraphEdge')             # <<<<<<<<<<<<<<
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+  __Pyx_GOTREF(__pyx_k_tuple_18);
+  __Pyx_INCREF(((PyObject *)__pyx_kp_s_17));
+  PyTuple_SET_ITEM(__pyx_k_tuple_18, 0, ((PyObject *)__pyx_kp_s_17));
+  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_17));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_18));
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+  /* "/Users/vchahun/Sandbox/cdec/python/src/hypergraph.pxi":228
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-  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_15));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_16));
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+  __pyx_k_tuple_21 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_21)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 13; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_21);
   __Pyx_INCREF(((PyObject *)__pyx_n_s__utf8));
-  PyTuple_SET_ITEM(__pyx_k_tuple_17, 0, ((PyObject *)__pyx_n_s__utf8));
+  PyTuple_SET_ITEM(__pyx_k_tuple_21, 0, ((PyObject *)__pyx_n_s__utf8));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__utf8));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_17));
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@@ -21422,12 +25406,12 @@ static int __Pyx_InitCachedConstants(void) {
  *         arcs = []
  *         cdef vector[lattice.LatticeArc] arc_vector = self.lattice[0][index]
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-  __pyx_k_tuple_20 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_20)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 21; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __Pyx_INCREF(((PyObject *)__pyx_kp_s_19));
-  PyTuple_SET_ITEM(__pyx_k_tuple_20, 0, ((PyObject *)__pyx_kp_s_19));
-  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_19));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_20));
+  __pyx_k_tuple_24 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_24)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 21; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_24);
+  __Pyx_INCREF(((PyObject *)__pyx_kp_s_23));
+  PyTuple_SET_ITEM(__pyx_k_tuple_24, 0, ((PyObject *)__pyx_kp_s_23));
+  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_23));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_24));
 
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@@ -21436,12 +25420,12 @@ static int __Pyx_InitCachedConstants(void) {
  *         cdef lattice.LatticeArc* arc
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-  __pyx_k_tuple_21 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_21)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_19));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_21));
+  __pyx_k_tuple_25 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_25)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 34; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_25);
+  __Pyx_INCREF(((PyObject *)__pyx_kp_s_23));
+  PyTuple_SET_ITEM(__pyx_k_tuple_25, 0, ((PyObject *)__pyx_kp_s_23));
+  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_23));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_25));
 
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-  __Pyx_GOTREF(__pyx_k_tuple_22);
+  __pyx_k_tuple_26 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_26)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 38; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_26);
   __Pyx_INCREF(((PyObject *)__pyx_n_s__utf8));
-  PyTuple_SET_ITEM(__pyx_k_tuple_22, 0, ((PyObject *)__pyx_n_s__utf8));
+  PyTuple_SET_ITEM(__pyx_k_tuple_26, 0, ((PyObject *)__pyx_n_s__utf8));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__utf8));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_22));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_26));
 
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-  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_28));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_29));
+  __pyx_k_tuple_33 = PyTuple_New(2); if (unlikely(!__pyx_k_tuple_33)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 64; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_33);
+  __Pyx_INCREF(((PyObject *)__pyx_kp_s_31));
+  PyTuple_SET_ITEM(__pyx_k_tuple_33, 0, ((PyObject *)__pyx_kp_s_31));
+  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_31));
+  __Pyx_INCREF(((PyObject *)__pyx_kp_s_32));
+  PyTuple_SET_ITEM(__pyx_k_tuple_33, 1, ((PyObject *)__pyx_kp_s_32));
+  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_32));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_33));
 
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@@ -21481,34 +25465,34 @@ static int __Pyx_InitCachedConstants(void) {
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-  __Pyx_GOTREF(__pyx_k_tuple_32);
+  __pyx_k_tuple_36 = PyTuple_New(4); if (unlikely(!__pyx_k_tuple_36)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 58; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   __Pyx_INCREF(((PyObject *)__pyx_n_s__i));
-  PyTuple_SET_ITEM(__pyx_k_tuple_32, 0, ((PyObject *)__pyx_n_s__i));
+  PyTuple_SET_ITEM(__pyx_k_tuple_36, 0, ((PyObject *)__pyx_n_s__i));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__i));
   __Pyx_INCREF(((PyObject *)__pyx_n_s__label));
-  PyTuple_SET_ITEM(__pyx_k_tuple_32, 1, ((PyObject *)__pyx_n_s__label));
+  PyTuple_SET_ITEM(__pyx_k_tuple_36, 1, ((PyObject *)__pyx_n_s__label));
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   __Pyx_INCREF(((PyObject *)__pyx_n_s__weight));
-  PyTuple_SET_ITEM(__pyx_k_tuple_32, 2, ((PyObject *)__pyx_n_s__weight));
+  PyTuple_SET_ITEM(__pyx_k_tuple_36, 2, ((PyObject *)__pyx_n_s__weight));
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   __Pyx_INCREF(((PyObject *)__pyx_n_s__delta));
-  PyTuple_SET_ITEM(__pyx_k_tuple_32, 3, ((PyObject *)__pyx_n_s__delta));
+  PyTuple_SET_ITEM(__pyx_k_tuple_36, 3, ((PyObject *)__pyx_n_s__delta));
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-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_32));
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+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_36));
+  __pyx_k_codeobj_37 = (PyObject*)__Pyx_PyCode_New(0, 0, 4, 0, 0, __pyx_empty_bytes, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_k_tuple_36, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_kp_s_38, __pyx_n_s__lines, 58, __pyx_empty_bytes); if (unlikely(!__pyx_k_codeobj_37)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 58; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
 
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  *             yield '}'
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-  __pyx_k_tuple_36 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_36)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 67; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __Pyx_GOTREF(__pyx_k_tuple_36);
+  __pyx_k_tuple_40 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_40)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 67; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_40);
   __Pyx_INCREF(((PyObject *)__pyx_n_s__utf8));
-  PyTuple_SET_ITEM(__pyx_k_tuple_36, 0, ((PyObject *)__pyx_n_s__utf8));
+  PyTuple_SET_ITEM(__pyx_k_tuple_40, 0, ((PyObject *)__pyx_n_s__utf8));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__utf8));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_36));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_40));
 
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-  __pyx_k_tuple_38 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_38)) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 79; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_37));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_38));
+  __pyx_k_tuple_42 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_42)) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 79; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_42);
+  __Pyx_INCREF(((PyObject *)__pyx_kp_s_41));
+  PyTuple_SET_ITEM(__pyx_k_tuple_42, 0, ((PyObject *)__pyx_kp_s_41));
+  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_41));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_42));
 
-  /* "_cdec.pyx":49
+  /* "_cdec.pyx":50
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-  __Pyx_GOTREF(__pyx_k_tuple_41);
+  __pyx_k_tuple_45 = PyTuple_New(2); if (unlikely(!__pyx_k_tuple_45)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 50; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_45);
   __Pyx_INCREF(((PyObject *)__pyx_n_s__formalism));
-  PyTuple_SET_ITEM(__pyx_k_tuple_41, 0, ((PyObject *)__pyx_n_s__formalism));
+  PyTuple_SET_ITEM(__pyx_k_tuple_45, 0, ((PyObject *)__pyx_n_s__formalism));
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   __Pyx_INCREF(Py_None);
-  PyTuple_SET_ITEM(__pyx_k_tuple_41, 1, Py_None);
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   __Pyx_GIVEREF(Py_None);
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_41));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_45));
 
-  /* "_cdec.pyx":87
+  /* "_cdec.pyx":88
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-  __pyx_k_tuple_45 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_45)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 87; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __Pyx_GIVEREF(((PyObject *)__pyx_kp_s_44));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_45));
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+  __Pyx_INCREF(((PyObject *)__pyx_kp_s_48));
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   __Pyx_INCREF(Py_None);
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   __Pyx_INCREF(Py_None);
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-  __Pyx_GIVEREF(((PyObject *)__pyx_n_s__utf8));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_47));
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-  /* "/Users/vchahun/Sandbox/cdec/python/src/trule.pxi":1
+  /* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":3
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+ * 
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@@ -21614,51 +25586,51 @@ static int __Pyx_InitCachedConstants(void) {
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-  __pyx_k_tuple_52 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_52)) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 143; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __Pyx_GOTREF(__pyx_k_tuple_52);
+  __pyx_k_tuple_55 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_55)) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 143; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_55);
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-  PyTuple_SET_ITEM(__pyx_k_tuple_52, 0, ((PyObject *)__pyx_n_s__IBM_BLEU));
+  PyTuple_SET_ITEM(__pyx_k_tuple_55, 0, ((PyObject *)__pyx_n_s__IBM_BLEU));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__IBM_BLEU));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_52));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_55));
 
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-  __Pyx_GOTREF(__pyx_k_tuple_53);
+  __pyx_k_tuple_56 = PyTuple_New(1); if (unlikely(!__pyx_k_tuple_56)) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 144; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_56);
   __Pyx_INCREF(((PyObject *)__pyx_n_s__TER));
-  PyTuple_SET_ITEM(__pyx_k_tuple_53, 0, ((PyObject *)__pyx_n_s__TER));
+  PyTuple_SET_ITEM(__pyx_k_tuple_56, 0, ((PyObject *)__pyx_n_s__TER));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__TER));
-  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_53));
+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_56));
 
-  /* "_cdec.pyx":27
+  /* "_cdec.pyx":28
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  * def _make_config(config):             # <<<<<<<<<<<<<<
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-  __Pyx_GOTREF(__pyx_k_tuple_54);
+  __pyx_k_tuple_57 = PyTuple_New(5); if (unlikely(!__pyx_k_tuple_57)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 28; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_k_tuple_57);
   __Pyx_INCREF(((PyObject *)__pyx_n_s__config));
-  PyTuple_SET_ITEM(__pyx_k_tuple_54, 0, ((PyObject *)__pyx_n_s__config));
+  PyTuple_SET_ITEM(__pyx_k_tuple_57, 0, ((PyObject *)__pyx_n_s__config));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__config));
   __Pyx_INCREF(((PyObject *)__pyx_n_s__key));
-  PyTuple_SET_ITEM(__pyx_k_tuple_54, 1, ((PyObject *)__pyx_n_s__key));
+  PyTuple_SET_ITEM(__pyx_k_tuple_57, 1, ((PyObject *)__pyx_n_s__key));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__key));
   __Pyx_INCREF(((PyObject *)__pyx_n_s__value));
-  PyTuple_SET_ITEM(__pyx_k_tuple_54, 2, ((PyObject *)__pyx_n_s__value));
+  PyTuple_SET_ITEM(__pyx_k_tuple_57, 2, ((PyObject *)__pyx_n_s__value));
   __Pyx_GIVEREF(((PyObject *)__pyx_n_s__value));
   __Pyx_INCREF(((PyObject *)__pyx_n_s__name));
-  PyTuple_SET_ITEM(__pyx_k_tuple_54, 3, ((PyObject *)__pyx_n_s__name));
+  PyTuple_SET_ITEM(__pyx_k_tuple_57, 3, ((PyObject *)__pyx_n_s__name));
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-  PyTuple_SET_ITEM(__pyx_k_tuple_54, 4, ((PyObject *)__pyx_n_s__info));
+  PyTuple_SET_ITEM(__pyx_k_tuple_57, 4, ((PyObject *)__pyx_n_s__info));
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+  __Pyx_GIVEREF(((PyObject *)__pyx_k_tuple_57));
+  __pyx_k_codeobj_58 = (PyObject*)__Pyx_PyCode_New(1, 0, 5, 0, 0, __pyx_empty_bytes, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_k_tuple_57, __pyx_empty_tuple, __pyx_empty_tuple, __pyx_kp_s_59, __pyx_n_s___make_config, 28, __pyx_empty_bytes); if (unlikely(!__pyx_k_codeobj_58)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 28; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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@@ -21748,26 +25720,43 @@ PyMODINIT_FUNC PyInit__cdec(void)
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   if (__Pyx_SetAttrString(__pyx_m, "SparseVector", (PyObject *)&__pyx_type_5_cdec_SparseVector) < 0) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  if (PyType_Ready(&__pyx_type_5_cdec_Hypergraph) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__Pyx_SetAttrString(__pyx_m, "Hypergraph", (PyObject *)&__pyx_type_5_cdec_Hypergraph) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec_Hypergraph = &__pyx_type_5_cdec_Hypergraph;
-  if (PyType_Ready(&__pyx_type_5_cdec_TRule) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__Pyx_SetAttrString(__pyx_m, "TRule", (PyObject *)&__pyx_type_5_cdec_TRule) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyType_Ready(&__pyx_type_5_cdec_NT) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 6; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "NT", (PyObject *)&__pyx_type_5_cdec_NT) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 6; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec_NT = &__pyx_type_5_cdec_NT;
+  if (PyType_Ready(&__pyx_type_5_cdec_NTRef) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 18; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "NTRef", (PyObject *)&__pyx_type_5_cdec_NTRef) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 18; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec_NTRef = &__pyx_type_5_cdec_NTRef;
+  if (PyType_Ready(&__pyx_type_5_cdec_BaseTRule) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "BaseTRule", (PyObject *)&__pyx_type_5_cdec_BaseTRule) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec_BaseTRule = &__pyx_type_5_cdec_BaseTRule;
+  __pyx_type_5_cdec_TRule.tp_base = __pyx_ptype_5_cdec_BaseTRule;
+  if (PyType_Ready(&__pyx_type_5_cdec_TRule) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 135; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "TRule", (PyObject *)&__pyx_type_5_cdec_TRule) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 135; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __pyx_ptype_5_cdec_TRule = &__pyx_type_5_cdec_TRule;
+  if (PyType_Ready(&__pyx_type_5_cdec_Grammar) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 146; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "Grammar", (PyObject *)&__pyx_type_5_cdec_Grammar) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 146; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec_Grammar = &__pyx_type_5_cdec_Grammar;
+  __pyx_type_5_cdec_TextGrammar.tp_base = __pyx_ptype_5_cdec_Grammar;
+  if (PyType_Ready(&__pyx_type_5_cdec_TextGrammar) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 169; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "TextGrammar", (PyObject *)&__pyx_type_5_cdec_TextGrammar) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 169; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec_TextGrammar = &__pyx_type_5_cdec_TextGrammar;
+  if (PyType_Ready(&__pyx_type_5_cdec_Hypergraph) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "Hypergraph", (PyObject *)&__pyx_type_5_cdec_Hypergraph) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec_Hypergraph = &__pyx_type_5_cdec_Hypergraph;
   __pyx_vtabptr_5_cdec_HypergraphEdge = &__pyx_vtable_5_cdec_HypergraphEdge;
   __pyx_vtable_5_cdec_HypergraphEdge.init = (PyObject *(*)(struct __pyx_obj_5_cdec_HypergraphEdge *, Hypergraph *, unsigned int))__pyx_f_5_cdec_14HypergraphEdge_init;
-  if (PyType_Ready(&__pyx_type_5_cdec_HypergraphEdge) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 133; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__Pyx_SetVtable(__pyx_type_5_cdec_HypergraphEdge.tp_dict, __pyx_vtabptr_5_cdec_HypergraphEdge) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 133; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__Pyx_SetAttrString(__pyx_m, "HypergraphEdge", (PyObject *)&__pyx_type_5_cdec_HypergraphEdge) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 133; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyType_Ready(&__pyx_type_5_cdec_HypergraphEdge) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 147; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetVtable(__pyx_type_5_cdec_HypergraphEdge.tp_dict, __pyx_vtabptr_5_cdec_HypergraphEdge) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 147; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "HypergraphEdge", (PyObject *)&__pyx_type_5_cdec_HypergraphEdge) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 147; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __pyx_ptype_5_cdec_HypergraphEdge = &__pyx_type_5_cdec_HypergraphEdge;
   __pyx_vtabptr_5_cdec_HypergraphNode = &__pyx_vtable_5_cdec_HypergraphNode;
   __pyx_vtable_5_cdec_HypergraphNode.init = (PyObject *(*)(struct __pyx_obj_5_cdec_HypergraphNode *, Hypergraph *, unsigned int))__pyx_f_5_cdec_14HypergraphNode_init;
-  if (PyType_Ready(&__pyx_type_5_cdec_HypergraphNode) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 179; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__Pyx_SetVtable(__pyx_type_5_cdec_HypergraphNode.tp_dict, __pyx_vtabptr_5_cdec_HypergraphNode) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 179; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__Pyx_SetAttrString(__pyx_m, "HypergraphNode", (PyObject *)&__pyx_type_5_cdec_HypergraphNode) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 179; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyType_Ready(&__pyx_type_5_cdec_HypergraphNode) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 193; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetVtable(__pyx_type_5_cdec_HypergraphNode.tp_dict, __pyx_vtabptr_5_cdec_HypergraphNode) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 193; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "HypergraphNode", (PyObject *)&__pyx_type_5_cdec_HypergraphNode) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 193; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __pyx_ptype_5_cdec_HypergraphNode = &__pyx_type_5_cdec_HypergraphNode;
-  if (PyType_Ready(&__pyx_type_5_cdec_Lattice) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 3; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__Pyx_SetAttrString(__pyx_m, "Lattice", (PyObject *)&__pyx_type_5_cdec_Lattice) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 3; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyType_Ready(&__pyx_type_5_cdec_Lattice) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 3; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "Lattice", (PyObject *)&__pyx_type_5_cdec_Lattice) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 3; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __pyx_ptype_5_cdec_Lattice = &__pyx_type_5_cdec_Lattice;
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   if (__Pyx_SetAttrString(__pyx_m, "Candidate", (PyObject *)&__pyx_type_5_cdec_Candidate) < 0) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 12; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
@@ -21784,68 +25773,74 @@ PyMODINIT_FUNC PyInit__cdec(void)
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   if (__Pyx_SetAttrString(__pyx_m, "Scorer", (PyObject *)&__pyx_type_5_cdec_Scorer) < 0) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 112; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __pyx_ptype_5_cdec_Scorer = &__pyx_type_5_cdec_Scorer;
-  if (PyType_Ready(&__pyx_type_5_cdec_Decoder) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 38; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__Pyx_SetAttrString(__pyx_m, "Decoder", (PyObject *)&__pyx_type_5_cdec_Decoder) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 38; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyType_Ready(&__pyx_type_5_cdec_Decoder) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 39; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "Decoder", (PyObject *)&__pyx_type_5_cdec_Decoder) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 39; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  __pyx_ptype_5_cdec___pyx_scope_struct_2_kbest = &__pyx_type_5_cdec___pyx_scope_struct_2_kbest;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_3_kbest_trees) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_3_kbest_trees = &__pyx_type_5_cdec___pyx_scope_struct_3_kbest_trees;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_4_kbest_features) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 61; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_4_kbest_features = &__pyx_type_5_cdec___pyx_scope_struct_4_kbest_features;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_5_sample) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 76; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_5_sample = &__pyx_type_5_cdec___pyx_scope_struct_5_sample;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_6___get__) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 115; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_6___get__ = &__pyx_type_5_cdec___pyx_scope_struct_6___get__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_7___get__) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 121; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_7___get__ = &__pyx_type_5_cdec___pyx_scope_struct_7___get__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_8__phrase) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_8__phrase = &__pyx_type_5_cdec___pyx_scope_struct_8__phrase;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_9_genexpr) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 2; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_9_genexpr = &__pyx_type_5_cdec___pyx_scope_struct_9_genexpr;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_10___str__) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_10___str__ = &__pyx_type_5_cdec___pyx_scope_struct_10___str__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_11_genexpr) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_11_genexpr = &__pyx_type_5_cdec___pyx_scope_struct_11_genexpr;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_12___get__) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 153; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_2__phrase) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 3; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_2__phrase = &__pyx_type_5_cdec___pyx_scope_struct_2__phrase;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_3_genexpr) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 4; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_3_genexpr = &__pyx_type_5_cdec___pyx_scope_struct_3_genexpr;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_4___get__) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 90; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_4___get__ = &__pyx_type_5_cdec___pyx_scope_struct_4___get__;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_5___str__) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 130; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_5___str__ = &__pyx_type_5_cdec___pyx_scope_struct_5___str__;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_6_genexpr) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 131; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_6_genexpr = &__pyx_type_5_cdec___pyx_scope_struct_6_genexpr;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_7___iter__) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 152; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_7___iter__ = &__pyx_type_5_cdec___pyx_scope_struct_7___iter__;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_8_kbest) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 31; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_8_kbest = &__pyx_type_5_cdec___pyx_scope_struct_8_kbest;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_9_kbest_trees) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_9_kbest_trees = &__pyx_type_5_cdec___pyx_scope_struct_9_kbest_trees;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_10_kbest_features) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 61; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_10_kbest_features = &__pyx_type_5_cdec___pyx_scope_struct_10_kbest_features;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_11_sample) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 76; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_11_sample = &__pyx_type_5_cdec___pyx_scope_struct_11_sample;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_12___get__) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 113; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __pyx_ptype_5_cdec___pyx_scope_struct_12___get__ = &__pyx_type_5_cdec___pyx_scope_struct_12___get__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_13___get__) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 189; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_13___get__) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 119; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __pyx_ptype_5_cdec___pyx_scope_struct_13___get__ = &__pyx_type_5_cdec___pyx_scope_struct_13___get__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_14___get__) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 195; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_14___get__) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 167; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __pyx_ptype_5_cdec___pyx_scope_struct_14___get__ = &__pyx_type_5_cdec___pyx_scope_struct_14___get__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_15___iter__) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 49; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_15___iter__ = &__pyx_type_5_cdec___pyx_scope_struct_15___iter__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_16_todot) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 57; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_16_todot = &__pyx_type_5_cdec___pyx_scope_struct_16_todot;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_17_lines) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 58; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_17_lines = &__pyx_type_5_cdec___pyx_scope_struct_17_lines;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_18___iter__) < 0) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 44; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_18___iter__ = &__pyx_type_5_cdec___pyx_scope_struct_18___iter__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_19___iter__) < 0) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 85; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_19___iter__ = &__pyx_type_5_cdec___pyx_scope_struct_19___iter__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_20__make_config) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_20__make_config = &__pyx_type_5_cdec___pyx_scope_struct_20__make_config;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_21___cinit__) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 42; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_21___cinit__ = &__pyx_type_5_cdec___pyx_scope_struct_21___cinit__;
-  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_22_genexpr) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5_cdec___pyx_scope_struct_22_genexpr = &__pyx_type_5_cdec___pyx_scope_struct_22_genexpr;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_15___get__) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 203; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_15___get__ = &__pyx_type_5_cdec___pyx_scope_struct_15___get__;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_16___get__) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 209; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_16___get__ = &__pyx_type_5_cdec___pyx_scope_struct_16___get__;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_17___iter__) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 49; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_17___iter__ = &__pyx_type_5_cdec___pyx_scope_struct_17___iter__;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_18_todot) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 57; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_18_todot = &__pyx_type_5_cdec___pyx_scope_struct_18_todot;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_19_lines) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 58; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_19_lines = &__pyx_type_5_cdec___pyx_scope_struct_19_lines;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_20___iter__) < 0) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 44; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_20___iter__ = &__pyx_type_5_cdec___pyx_scope_struct_20___iter__;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_21___iter__) < 0) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 85; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_21___iter__ = &__pyx_type_5_cdec___pyx_scope_struct_21___iter__;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_22__make_config) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 28; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_22__make_config = &__pyx_type_5_cdec___pyx_scope_struct_22__make_config;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_23___cinit__) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_23___cinit__ = &__pyx_type_5_cdec___pyx_scope_struct_23___cinit__;
+  if (PyType_Ready(&__pyx_type_5_cdec___pyx_scope_struct_24_genexpr) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 54; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5_cdec___pyx_scope_struct_24_genexpr = &__pyx_type_5_cdec___pyx_scope_struct_24_genexpr;
   /*--- Type import code ---*/
   /*--- Variable import code ---*/
   /*--- Function import code ---*/
   /*--- Execution code ---*/
 
-  /* "/Users/vchahun/Sandbox/cdec/python/src/trule.pxi":1
+  /* "/Users/vchahun/Sandbox/cdec/python/src/grammar.pxi":3
+ * cimport grammar
+ * 
  * def _phrase(phrase):             # <<<<<<<<<<<<<<
- *     return ' '.join('[%s,%d]' % w if isinstance(w, tuple) else w.encode('utf8') for w in phrase)
+ *     return ' '.join(w.encode('utf8') if isinstance(w, unicode) else str(w) for w in phrase)
  * 
  */
-  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_5_cdec_1_phrase, NULL, __pyx_n_s___cdec); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_5_cdec_1_phrase, NULL, __pyx_n_s___cdec); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 3; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(__pyx_t_1);
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s___phrase, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s___phrase, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 3; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
   /* "/Users/vchahun/Sandbox/cdec/python/src/mteval.pxi":143
@@ -21854,7 +25849,7 @@ PyMODINIT_FUNC PyInit__cdec(void)
  * BLEU = Scorer('IBM_BLEU')             # <<<<<<<<<<<<<<
  * TER = Scorer('TER')
  */
-  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_Scorer)), ((PyObject *)__pyx_k_tuple_52), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 143; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_Scorer)), ((PyObject *)__pyx_k_tuple_55), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 143; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(__pyx_t_1);
   if (PyObject_SetAttr(__pyx_m, __pyx_n_s__BLEU, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 143; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
@@ -21864,12 +25859,12 @@ PyMODINIT_FUNC PyInit__cdec(void)
  * BLEU = Scorer('IBM_BLEU')
  * TER = Scorer('TER')             # <<<<<<<<<<<<<<
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+  __pyx_t_1 = PyObject_Call(((PyObject *)((PyObject*)__pyx_ptype_5_cdec_Scorer)), ((PyObject *)__pyx_k_tuple_56), NULL); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[5]; __pyx_lineno = 144; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
-  /* "_cdec.pyx":21
+  /* "_cdec.pyx":22
  * include "mteval.pxi"
  * 
  * SetSilent(True)             # <<<<<<<<<<<<<<
@@ -21878,7 +25873,7 @@ PyMODINIT_FUNC PyInit__cdec(void)
  */
   SetSilent(1);
 
-  /* "_cdec.pyx":22
+  /* "_cdec.pyx":23
  * 
  * SetSilent(True)
  * decoder.register_feature_functions()             # <<<<<<<<<<<<<<
@@ -21887,58 +25882,58 @@ PyMODINIT_FUNC PyInit__cdec(void)
  */
   register_feature_functions();
 
-  /* "_cdec.pyx":24
+  /* "_cdec.pyx":25
  * decoder.register_feature_functions()
  * 
  * class InvalidConfig(Exception): pass             # <<<<<<<<<<<<<<
  * class ParseFailed(Exception): pass
  * 
  */
-  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 24; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(((PyObject *)__pyx_t_1));
-  __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 24; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(__pyx_t_2);
   __Pyx_INCREF(__pyx_builtin_Exception);
   PyTuple_SET_ITEM(__pyx_t_2, 0, __pyx_builtin_Exception);
   __Pyx_GIVEREF(__pyx_builtin_Exception);
-  __pyx_t_3 = __Pyx_CreateClass(((PyObject *)__pyx_t_2), ((PyObject *)__pyx_t_1), __pyx_n_s__InvalidConfig, __pyx_n_s___cdec); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 24; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_3 = __Pyx_CreateClass(((PyObject *)__pyx_t_2), ((PyObject *)__pyx_t_1), __pyx_n_s__InvalidConfig, __pyx_n_s___cdec); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(__pyx_t_3);
   __Pyx_DECREF(((PyObject *)__pyx_t_2)); __pyx_t_2 = 0;
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+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__InvalidConfig, __pyx_t_3) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
   __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
 
-  /* "_cdec.pyx":25
+  /* "_cdec.pyx":26
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  * class InvalidConfig(Exception): pass
  * class ParseFailed(Exception): pass             # <<<<<<<<<<<<<<
  * 
  * def _make_config(config):
  */
-  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(((PyObject *)__pyx_t_1));
-  __pyx_t_3 = PyTuple_New(1); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_3 = PyTuple_New(1); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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   PyTuple_SET_ITEM(__pyx_t_3, 0, __pyx_builtin_Exception);
   __Pyx_GIVEREF(__pyx_builtin_Exception);
-  __pyx_t_2 = __Pyx_CreateClass(((PyObject *)__pyx_t_3), ((PyObject *)__pyx_t_1), __pyx_n_s__ParseFailed, __pyx_n_s___cdec); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_2 = __Pyx_CreateClass(((PyObject *)__pyx_t_3), ((PyObject *)__pyx_t_1), __pyx_n_s__ParseFailed, __pyx_n_s___cdec); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(__pyx_t_2);
   __Pyx_DECREF(((PyObject *)__pyx_t_3)); __pyx_t_3 = 0;
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__ParseFailed, __pyx_t_2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 25; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__ParseFailed, __pyx_t_2) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
   __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
 
-  /* "_cdec.pyx":27
+  /* "_cdec.pyx":28
  * class ParseFailed(Exception): pass
  * 
  * def _make_config(config):             # <<<<<<<<<<<<<<
  *     for key, value in config.items():
  *         if isinstance(value, dict):
  */
-  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_5_cdec_3_make_config, NULL, __pyx_n_s___cdec); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_5_cdec_3_make_config, NULL, __pyx_n_s___cdec); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 28; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_GOTREF(__pyx_t_1);
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s___make_config, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s___make_config, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 28; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
   /* "_cdec.pyx":1
@@ -22187,6 +26182,10 @@ static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
     return 0;
 }
 
+static CYTHON_INLINE void __Pyx_RaiseClosureNameError(const char *varname) {
+    PyErr_Format(PyExc_NameError, "free variable '%s' referenced before assignment in enclosing scope", varname);
+}
+
 static void __Pyx_RaiseDoubleKeywordsError(
     const char* func_name,
     PyObject* kw_name)
@@ -22302,35 +26301,7 @@ static void __Pyx_RaiseArgtupleInvalid(
                  (num_expected == 1) ? "" : "s", num_found);
 }
 
-static CYTHON_INLINE void __Pyx_RaiseClosureNameError(const char *varname) {
-    PyErr_Format(PyExc_NameError, "free variable '%s' referenced before assignment in enclosing scope", varname);
-}
 
-static CYTHON_INLINE PyObject *__Pyx_PyIter_Next2(PyObject* iterator, PyObject* defval) {
-    PyObject* next;
-    if (unlikely(!PyIter_Check(iterator))) {
-        PyErr_Format(PyExc_TypeError,
-            "%.200s object is not an iterator", iterator->ob_type->tp_name);
-        return NULL;
-    }
-    next = (*(Py_TYPE(iterator)->tp_iternext))(iterator);
-    if (likely(next)) {
-        return next;
-    } else if (defval) {
-        if (PyErr_Occurred()) {
-            if(!PyErr_ExceptionMatches(PyExc_StopIteration))
-                return NULL;
-            PyErr_Clear();
-        }
-        Py_INCREF(defval);
-        return defval;
-    } else if (PyErr_Occurred()) {
-        return NULL;
-    } else {
-        PyErr_SetNone(PyExc_StopIteration);
-        return NULL;
-    }
-}
 
 static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index) {
     PyErr_Format(PyExc_ValueError,
@@ -22359,7 +26330,31 @@ static int __Pyx_IternextUnpackEndCheck(PyObject *retval, Py_ssize_t expected) {
     return 0;
 }
 
-
+static CYTHON_INLINE PyObject *__Pyx_PyIter_Next2(PyObject* iterator, PyObject* defval) {
+    PyObject* next;
+    if (unlikely(!PyIter_Check(iterator))) {
+        PyErr_Format(PyExc_TypeError,
+            "%.200s object is not an iterator", iterator->ob_type->tp_name);
+        return NULL;
+    }
+    next = (*(Py_TYPE(iterator)->tp_iternext))(iterator);
+    if (likely(next)) {
+        return next;
+    } else if (defval) {
+        if (PyErr_Occurred()) {
+            if(!PyErr_ExceptionMatches(PyExc_StopIteration))
+                return NULL;
+            PyErr_Clear();
+        }
+        Py_INCREF(defval);
+        return defval;
+    } else if (PyErr_Occurred()) {
+        return NULL;
+    } else {
+        PyErr_SetNone(PyExc_StopIteration);
+        return NULL;
+    }
+}
 
 static double __Pyx__PyObject_AsDouble(PyObject* obj) {
     PyObject* float_value;
@@ -22500,6 +26495,58 @@ static PyObject *__Pyx_CreateClass(PyObject *bases, PyObject *dict, PyObject *na
     return result;
 }
 
+static CYTHON_INLINE WordID __Pyx_PyInt_from_py_WordID(PyObject* x) {
+    const WordID neg_one = (WordID)-1, const_zero = (WordID)0;
+    const int is_unsigned = const_zero < neg_one;
+    if (sizeof(WordID) == sizeof(char)) {
+        if (is_unsigned)
+            return (WordID)__Pyx_PyInt_AsUnsignedChar(x);
+        else
+            return (WordID)__Pyx_PyInt_AsSignedChar(x);
+    } else if (sizeof(WordID) == sizeof(short)) {
+        if (is_unsigned)
+            return (WordID)__Pyx_PyInt_AsUnsignedShort(x);
+        else
+            return (WordID)__Pyx_PyInt_AsSignedShort(x);
+    } else if (sizeof(WordID) == sizeof(int)) {
+        if (is_unsigned)
+            return (WordID)__Pyx_PyInt_AsUnsignedInt(x);
+        else
+            return (WordID)__Pyx_PyInt_AsSignedInt(x);
+    } else if (sizeof(WordID) == sizeof(long)) {
+        if (is_unsigned)
+            return (WordID)__Pyx_PyInt_AsUnsignedLong(x);
+        else
+            return (WordID)__Pyx_PyInt_AsSignedLong(x);
+    } else if (sizeof(WordID) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return (WordID)__Pyx_PyInt_AsUnsignedLongLong(x);
+        else
+            return (WordID)__Pyx_PyInt_AsSignedLongLong(x);
+    }  else {
+        WordID val;
+        PyObject *v = __Pyx_PyNumber_Int(x);
+        #if PY_VERSION_HEX < 0x03000000
+        if (likely(v) && !PyLong_Check(v)) {
+            PyObject *tmp = v;
+            v = PyNumber_Long(tmp);
+            Py_DECREF(tmp);
+        }
+        #endif
+        if (likely(v)) {
+            int one = 1; int is_little = (int)*(unsigned char *)&one;
+            unsigned char *bytes = (unsigned char *)&val;
+            int ret = _PyLong_AsByteArray((PyLongObject *)v,
+                                          bytes, sizeof(val),
+                                          is_little, !is_unsigned);
+            Py_DECREF(v);
+            if (likely(!ret))
+                return val;
+        }
+        return (WordID)-1;
+    }
+}
+
 static PyObject* __Pyx_Globals() {
     Py_ssize_t i;
     /*PyObject *d;*/
diff --git a/python/src/_cdec.pyx b/python/src/_cdec.pyx
index 164d6570..c60f342f 100644
--- a/python/src/_cdec.pyx
+++ b/python/src/_cdec.pyx
@@ -3,17 +3,18 @@ from libcpp.vector cimport vector
 from utils cimport *
 cimport decoder
 
-cdef char* as_str(sentence, error_msg='Cannot convert type %s to str'):
+cdef char* as_str(data, error_msg='Cannot convert type %s to str'):
     cdef bytes ret
-    if isinstance(sentence, unicode):
-        ret = sentence.encode('utf8')
-    elif isinstance(sentence, str):
-        ret = sentence
+    if isinstance(data, unicode):
+        ret = data.encode('utf8')
+    elif isinstance(data, str):
+        ret = data
     else:
-        raise TypeError(error_msg % type(sentence))
+        raise TypeError(error_msg % type(data))
     return ret
 
 include "vectors.pxi"
+include "grammar.pxi"
 include "hypergraph.pxi"
 include "lattice.pxi"
 include "mteval.pxi"
@@ -89,18 +90,20 @@ cdef class Decoder:
                 self.weights[fname.strip()] = float(value)
 
     def translate(self, sentence, grammar=None):
-        if isinstance(sentence, unicode):
-            inp = sentence.strip().encode('utf8')
-        elif isinstance(sentence, str):
-            inp = sentence.strip()
+        cdef bytes input_str
+        if isinstance(sentence, unicode) or isinstance(sentence, str):
+            input_str = as_str(sentence.strip())
         elif isinstance(sentence, Lattice):
-            inp = str(sentence) # PLF format
+            input_str = str(sentence) # PLF format
         else:
             raise TypeError('Cannot translate input type %s' % type(sentence))
         if grammar:
-            self.dec.AddSupplementalGrammarFromString(string(<char *> grammar))
+            if isinstance(grammar, str) or isinstance(grammar, unicode):
+                self.dec.AddSupplementalGrammarFromString(string(as_str(grammar)))
+            else:
+                self.dec.AddSupplementalGrammar(TextGrammar(grammar).grammar[0])
         cdef decoder.BasicObserver observer = decoder.BasicObserver()
-        self.dec.Decode(string(<char *>inp), &observer)
+        self.dec.Decode(string(input_str), &observer)
         if observer.hypergraph == NULL:
             raise ParseFailed()
         cdef Hypergraph hg = Hypergraph()
diff --git a/python/src/decoder.pxd b/python/src/decoder.pxd
index 660bcb39..d2065579 100644
--- a/python/src/decoder.pxd
+++ b/python/src/decoder.pxd
@@ -1,7 +1,8 @@
 from libcpp.string cimport string
 from libcpp.vector cimport vector
 from hypergraph cimport Hypergraph
-from utils cimport istream, weight_t, variables_map
+from grammar cimport Grammar
+from utils cimport *
 
 cdef extern from "decoder/ff_register.h":
     void register_feature_functions()
@@ -28,8 +29,8 @@ cdef extern from "decoder/decoder.h":
         # add grammar rules (currently only supported by SCFG decoders)
         # that will be used on subsequent calls to Decode. rules should be in standard
         # text format. This function does NOT read from a file.
-        void SetSupplementalGrammar(string& grammar)
-        void SetSentenceGrammarFromString(string& grammar_str)
+        void AddSupplementalGrammarFromString(string& grammar_str)
+        void AddSupplementalGrammar(shared_ptr[Grammar] grammar)
 
 cdef extern from "observer.h":
     cdef cppclass BasicObserver(DecoderObserver):
diff --git a/python/src/grammar.pxd b/python/src/grammar.pxd
new file mode 100644
index 00000000..43806f71
--- /dev/null
+++ b/python/src/grammar.pxd
@@ -0,0 +1,43 @@
+from libcpp.vector cimport vector
+from libcpp.string cimport string
+from utils cimport *
+
+cdef extern from "decoder/trule.h":
+
+    cdef cppclass AlignmentPoint:
+        AlignmentPoint(int s, int t)
+        AlignmentPoint Inverted()
+        short s_
+        short t_
+
+    cdef cppclass TRule:
+        vector[WordID] f_
+        vector[WordID] e_
+        vector[AlignmentPoint] a_
+        FastSparseVector[weight_t] scores_
+        WordID lhs_
+        int arity_
+        bint IsUnary()
+        bint IsGoal()
+        void ComputeArity()
+
+cdef extern from "decoder/grammar.h":
+    cdef cppclass RuleBin "const RuleBin":
+        int GetNumRules()
+        shared_ptr[TRule] GetIthRule(int i)
+        int Arity()
+
+    cdef cppclass GrammarIter "const GrammarIter":
+        RuleBin* GetRules()
+        GrammarIter* Extend(int symbol)
+
+    cdef cppclass Grammar:
+        GrammarIter* GetRoot()
+        bint HasRuleForSpan(int i, int j, int distance)
+        unsigned GetCTFLevels()
+        string GetGrammarName()
+        void SetGrammarName(string)
+
+    cdef cppclass TextGrammar(Grammar):
+        TextGrammar()
+        void AddRule(shared_ptr[TRule]& rule)
diff --git a/python/src/grammar.pxi b/python/src/grammar.pxi
new file mode 100644
index 00000000..80d9fbf5
--- /dev/null
+++ b/python/src/grammar.pxi
@@ -0,0 +1,176 @@
+cimport grammar
+
+def _phrase(phrase):
+    return ' '.join(w.encode('utf8') if isinstance(w, unicode) else str(w) for w in phrase)
+
+cdef class NT:
+    cdef public char* cat
+    cdef public unsigned ref
+    def __init__(self, cat, ref=0):
+        self.cat = cat
+        self.ref = ref
+
+    def __str__(self):
+        if self.ref > 0:
+            return '[%s,%d]' % (self.cat, self.ref)
+        return '[%s]' % self.cat
+
+cdef class NTRef:
+    cdef public unsigned ref
+    def __init__(self, ref):
+        self.ref = ref
+
+    def __str__(self):
+        return '[%d]' % self.ref
+
+cdef class BaseTRule:
+    cdef shared_ptr[grammar.TRule]* rule
+
+    def __dealloc__(self):
+        del self.rule
+
+    property arity:
+        def __get__(self):
+            return self.rule.get().arity_
+
+    property f:
+        def __get__(self):
+            cdef vector[WordID]* f_ = &self.rule.get().f_
+            cdef WordID w
+            cdef f = []
+            cdef unsigned i
+            cdef int idx = 0
+            for i in range(f_.size()):
+                w = f_[0][i]
+                if w < 0:
+                    idx += 1
+                    f.append(NT(TDConvert(-w), idx))
+                else:
+                    f.append(unicode(TDConvert(w), encoding='utf8'))
+            return f
+
+        def __set__(self, f):
+            cdef vector[WordID]* f_ = &self.rule.get().f_
+            f_.resize(len(f))
+            cdef unsigned i
+            cdef int idx = 0
+            for i in range(len(f)):
+                if isinstance(f[i], NT):
+                    f_[0][i] = -TDConvert(<char *>f[i].cat)
+                else:
+                    f_[0][i] = TDConvert(<char *>as_str(f[i]))
+
+    property e:
+        def __get__(self):
+            cdef vector[WordID]* e_ = &self.rule.get().e_
+            cdef WordID w
+            cdef e = []
+            cdef unsigned i
+            cdef int idx = 0
+            for i in range(e_.size()):
+                w = e_[0][i]
+                if w < 1:
+                    idx += 1
+                    e.append(NTRef(1-w))
+                else:
+                    e.append(unicode(TDConvert(w), encoding='utf8'))
+            return e
+
+        def __set__(self, e):
+            cdef vector[WordID]* e_ = &self.rule.get().e_
+            e_.resize(len(e))
+            cdef unsigned i
+            for i in range(len(e)):
+                if isinstance(e[i], NTRef):
+                    e_[0][i] = 1-e[i].ref
+                else:
+                    e_[0][i] = TDConvert(<char *>as_str(e[i]))
+
+    property a:
+        def __get__(self):
+            cdef unsigned i
+            cdef vector[grammar.AlignmentPoint]* a = &self.rule.get().a_
+            for i in range(a.size()):
+                yield (a[0][i].s_, a[0][i].t_)
+
+        def __set__(self, a):
+            cdef vector[grammar.AlignmentPoint]* a_ = &self.rule.get().a_
+            a_.resize(len(a))
+            cdef unsigned i
+            cdef int s, t
+            for i in range(len(a)):
+                s, t = a[i]
+                a_[0][i] = grammar.AlignmentPoint(s, t)
+
+    property scores:
+        def __get__(self):
+            cdef SparseVector scores = SparseVector()
+            scores.vector = new FastSparseVector[double](self.rule.get().scores_)
+            return scores
+
+        def __set__(self, scores):
+            cdef FastSparseVector[double]* scores_ = &self.rule.get().scores_
+            scores_.clear()
+            cdef int fid
+            cdef float fval
+            for fname, fval in scores.items():
+                fid = FDConvert(<char *>as_str(fname))
+                if fid < 0: raise KeyError(fname)
+                scores_.set_value(fid, fval)
+
+    property lhs:
+        def __get__(self):
+            return NT(TDConvert(-self.rule.get().lhs_))
+
+        def __set__(self, lhs):
+            if not isinstance(lhs, NT):
+                lhs = NT(lhs)
+            self.rule.get().lhs_ = -TDConvert(<char *>lhs.cat)
+
+    def __str__(self):
+        scores = ' '.join('%s=%s' % feat for feat in self.scores)
+        return '%s ||| %s ||| %s ||| %s' % (self.lhs,
+                _phrase(self.f), _phrase(self.e), scores)
+
+cdef class TRule(BaseTRule):
+    def __cinit__(self, lhs, f, e, scores, a=None):
+        self.rule = new shared_ptr[grammar.TRule](new grammar.TRule())
+        self.lhs = lhs
+        self.e = e
+        self.f = f
+        self.scores = scores
+        if a:
+            self.a = a
+        self.rule.get().ComputeArity()
+
+cdef class Grammar:
+    cdef shared_ptr[grammar.Grammar]* grammar
+    
+    def __dealloc__(self):
+        del self.grammar
+    
+    def __iter__(self):
+        cdef grammar.GrammarIter* root = self.grammar.get().GetRoot()
+        cdef grammar.RuleBin* rbin = root.GetRules()
+        cdef TRule trule
+        cdef unsigned i
+        for i in range(rbin.GetNumRules()):
+            trule = TRule()
+            trule.rule = new shared_ptr[grammar.TRule](rbin.GetIthRule(i))
+            yield trule
+
+    property name:
+        def __get__(self):
+            self.grammar.get().GetGrammarName().c_str()
+
+        def __set__(self, name):
+            self.grammar.get().SetGrammarName(string(<char *>name))
+
+cdef class TextGrammar(Grammar):
+    def __cinit__(self, rules):
+        self.grammar = new shared_ptr[grammar.Grammar](new grammar.TextGrammar())
+        cdef grammar.TextGrammar* _g = <grammar.TextGrammar*> self.grammar.get()
+        for trule in rules:
+            if not isinstance(trule, BaseTRule):
+                raise ValueError('the grammar should contain TRule objects')
+            _g.AddRule((<BaseTRule> trule).rule[0])
diff --git a/python/src/hypergraph.pxd b/python/src/hypergraph.pxd
index 14c60dd0..e51ccf5c 100644
--- a/python/src/hypergraph.pxd
+++ b/python/src/hypergraph.pxd
@@ -1,18 +1,9 @@
 from libcpp.string cimport string
 from libcpp.vector cimport vector
 from utils cimport *
+from grammar cimport TRule
 from lattice cimport Lattice
 
-cdef extern from "decoder/trule.h":
-    cdef cppclass TRule:
-        vector[WordID] f_
-        vector[WordID] e_
-        FastSparseVector[weight_t] scores_
-        WordID lhs_
-        int arity_
-        bint IsUnary()
-        bint IsGoal()
-
 cdef extern from "decoder/hg.h":
     cdef cppclass EdgeMask "std::vector<bool>":
         EdgeMask(int size)
@@ -40,6 +31,7 @@ cdef extern from "decoder/hg.h":
         vector[HypergraphNode] nodes_
         vector[HypergraphEdge] edges_
         int GoalNode()
+        double NumberOfPaths()
         void Reweight(vector[weight_t]& weights)
         void Reweight(FastSparseVector& weights)
         bint PruneInsideOutside(double beam_alpha,
@@ -83,3 +75,6 @@ cdef extern from "decoder/hg_sampler.h" namespace "HypergraphSampler":
 
 cdef extern from "decoder/csplit.h" namespace "CompoundSplit":
     int GetFullWordEdgeIndex(Hypergraph& forest)
+
+cdef extern from "decoder/inside_outside.h":
+    LogVal[double] InsideOutside "InsideOutside<prob_t, EdgeProb, SparseVector<prob_t>, EdgeFeaturesAndProbWeightFunction>" (Hypergraph& hg, FastSparseVector[LogVal[double]]* result)
diff --git a/python/src/hypergraph.pxi b/python/src/hypergraph.pxi
index 2e2c04a2..86751cc9 100644
--- a/python/src/hypergraph.pxi
+++ b/python/src/hypergraph.pxi
@@ -109,8 +109,6 @@ cdef class Hypergraph:
         else:
             raise TypeError('cannot reweight hypergraph with %s' % type(weights))
 
-    # TODO get feature expectations, get partition function ("inside" score)
-
     property edges:
         def __get__(self):
             cdef unsigned i
@@ -127,19 +125,35 @@ cdef class Hypergraph:
         def __get__(self):
             return HypergraphNode().init(self.hg, self.hg.GoalNode())
 
-
-include "trule.pxi"
+    property npaths:
+        def __get__(self):
+            return self.hg.NumberOfPaths()
+
+    def inside_outside(self):
+        cdef FastSparseVector[LogVal[double]]* result = new FastSparseVector[LogVal[double]]()
+        cdef LogVal[double] z = hypergraph.InsideOutside(self.hg[0], result)
+        result[0] /= z
+        cdef SparseVector vector = SparseVector()
+        vector.vector = new FastSparseVector[double]()
+        cdef FastSparseVector[LogVal[double]].const_iterator* it = new FastSparseVector[LogVal[double]].const_iterator(result[0], False)
+        cdef unsigned i
+        for i in range(result.size()):
+            vector.vector.set_value(it[0].ptr().first, log(it[0].ptr().second))
+            pinc(it[0]) # ++it
+        del it
+        del result
+        return vector
 
 cdef class HypergraphEdge:
     cdef hypergraph.Hypergraph* hg
     cdef hypergraph.HypergraphEdge* edge
-    cdef public TRule trule
+    cdef public BaseTRule trule
 
     cdef init(self, hypergraph.Hypergraph* hg, unsigned i):
         self.hg = hg
         self.edge = &hg.edges_[i]
-        self.trule = TRule()
-        self.trule.rule = self.edge.rule_.get()
+        self.trule = BaseTRule()
+        self.trule.rule = new shared_ptr[grammar.TRule](self.edge.rule_)
         return self
 
     def __len__(self):
diff --git a/python/src/lattice.pxi b/python/src/lattice.pxi
index c6b29e8b..08405188 100644
--- a/python/src/lattice.pxi
+++ b/python/src/lattice.pxi
@@ -3,7 +3,7 @@ cimport lattice
 cdef class Lattice:
     cdef lattice.Lattice* lattice
 
-    def __init__(self, inp):
+    def __cinit__(self, inp):
         if isinstance(inp, tuple):
             self.lattice = new lattice.Lattice(len(inp))
             for i, arcs in enumerate(inp):
diff --git a/python/src/trule.pxi b/python/src/trule.pxi
deleted file mode 100644
index 6168014d..00000000
--- a/python/src/trule.pxi
+++ /dev/null
@@ -1,55 +0,0 @@
-def _phrase(phrase):
-    return ' '.join('[%s,%d]' % w if isinstance(w, tuple) else w.encode('utf8') for w in phrase)
-
-cdef class TRule:
-    cdef hypergraph.TRule* rule
-
-    property arity:
-        def __get__(self):
-            return self.rule.arity_
-
-    property f:
-        def __get__(self):
-            cdef vector[WordID]* f = &self.rule.f_
-            cdef WordID w
-            cdef words = []
-            cdef unsigned i
-            cdef int idx = 0
-            for i in range(f.size()):
-                w = f[0][i]
-                if w < 0:
-                    idx += 1
-                    words.append((TDConvert(-w), idx))
-                else:
-                    words.append(unicode(TDConvert(w), encoding='utf8'))
-            return words
-
-    property e:
-        def __get__(self):
-            cdef vector[WordID]* e = &self.rule.e_
-            cdef WordID w
-            cdef words = []
-            cdef unsigned i
-            cdef int idx = 0
-            for i in range(e.size()):
-                w = e[0][i]
-                if w < 1:
-                    idx += 1
-                    words.append((TDConvert(1-w), idx))
-                else:
-                    words.append(unicode(TDConvert(w), encoding='utf8'))
-            return words
-
-    property scores:
-        def __get__(self):
-            cdef SparseVector scores = SparseVector()
-            scores.vector = new FastSparseVector[double](self.rule.scores_)
-            return scores
-
-    property lhs:
-        def __get__(self):
-            return TDConvert(-self.rule.lhs_)
-
-    def __str__(self):
-        scores = ' '.join('%s=%s' % feat for feat in self.scores)
-        return '[%s] ||| %s ||| %s ||| %s' % (self.lhs, _phrase(self.f), _phrase(self.e), scores)
diff --git a/python/src/utils.pxd b/python/src/utils.pxd
index 15e77c49..f4da686b 100644
--- a/python/src/utils.pxd
+++ b/python/src/utils.pxd
@@ -47,6 +47,7 @@ cdef extern from "utils/sparse_vector.h":
         bint operator==(FastSparseVector[T]&)
         T dot(vector[weight_t]&) # cython bug when [T]
         T dot(FastSparseVector[T]&)
+        void clear()
 
     FastSparseVector[weight_t] operator+(FastSparseVector[weight_t]&, FastSparseVector[weight_t]&)
     FastSparseVector[weight_t] operator-(FastSparseVector[weight_t]&, FastSparseVector[weight_t]&)
@@ -82,6 +83,7 @@ cdef extern from "utils/sampler.h":
 
 cdef extern from "<boost/shared_ptr.hpp>" namespace "boost":
     cdef cppclass shared_ptr[T]:
+        shared_ptr(T* ptr)
         shared_ptr(shared_ptr& r)
         T* get()
 
diff --git a/python/src/vectors.pxi b/python/src/vectors.pxi
index ce95968c..cd1c2598 100644
--- a/python/src/vectors.pxi
+++ b/python/src/vectors.pxi
@@ -54,6 +54,7 @@ cdef class SparseVector:
 
     def __iter__(self):
         cdef FastSparseVector[weight_t].const_iterator* it = new FastSparseVector[weight_t].const_iterator(self.vector[0], False)
+        cdef unsigned i
         try:
             for i in range(self.vector.size()):
                 yield (FDConvert(it[0].ptr().first).c_str(), it[0].ptr().second)
diff --git a/python/test.py b/python/test.py
index 54859e81..eb9e6a95 100644
--- a/python/test.py
+++ b/python/test.py
@@ -45,6 +45,9 @@ for sentence in forest.sample(5):
 # Get feature vector for 1best
 fsrc = forest.viterbi_features()
 
+# Feature expectations
+print 'Feature expectations:', dict(forest.inside_outside())
+
 # Reference lattice
 lattice = ((('australia',0,1),),(('is',0,1),),(('one',0,1),),(('of',0,1),),(('the',0,4),('a',0,4),('a',0,1),('the',0,1),),(('small',0,1),('tiny',0,1),('miniscule',0,1),('handful',0,2),),(('number',0,1),('group',0,1),),(('of',0,2),),(('few',0,1),),(('countries',0,1),),(('that',0,1),),(('has',0,1),('have',0,1),),(('diplomatic',0,1),),(('relations',0,1),),(('with',0,1),),(('north',0,1),),(('korea',0,1),),(('.',0,1),),)