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+1. word_pair_keys
+ group rules by source/target word pairs
+ input is a cdec grammar (with int index), one rule per line
+
+2. rules_cross_product
+ build cross product of rules w/ same key
+ input is output of 1
+
+3. merge_rules
+ mapred version of merge_rules.rb
+
+NOTE
+ cross product doesn't even work with g120:
+ 319078851 megabytes ~= 300 terabytes
+