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-rw-r--r--klm/search/arity.hh8
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diff --git a/klm/search/arity.hh b/klm/search/arity.hh
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+#ifndef SEARCH_ARITY__
+#define SEARCH_ARITY__
+namespace search {
+
+const unsigned int kMaxArity = 2;
+
+} // namespace search
+#endif // SEARCH_ARITY__