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diff --git a/src/smt_util/nary_builder.h b/src/smt_util/nary_builder.h
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+/*********************                                                        */
+/*! \file nary_builder.h
+ ** \verbatim
+ ** Original author: Tim King
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2014  New York University and The University of Iowa
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief [[ Add one-line brief description here ]]
+ **
+ ** [[ Add lengthier description here ]]
+ ** \todo document this file
+ **/
+
+
+#include "cvc4_private.h"
+
+#pragma once
+
+#include <vector>
+#include "expr/node.h"
+
+namespace CVC4{
+namespace util {
+
+class NaryBuilder {
+public:
+  static Node mkAssoc(Kind k, const std::vector<Node>& children);
+  static Node zeroArity(Kind k);
+};/* class NaryBuilder */
+
+class RePairAssocCommutativeOperators {
+public:
+  RePairAssocCommutativeOperators();
+  ~RePairAssocCommutativeOperators();
+
+  Node rePairAssocCommutativeOperators(TNode n);
+
+  static bool isAssociateCommutative(Kind k);
+
+  size_t size() const;
+  void clear();
+private:
+  Node case_assoccomm(TNode n);
+  Node case_other(TNode n);
+
+  typedef std::hash_map<Node, Node, NodeHashFunction> NodeMap;
+  NodeMap d_cache;
+};/* class RePairAssocCommutativeOperators */
+
+}/* util namespace */
+}/* CVC4 namespace */