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diff --git a/src/theory/arith/arithvar_dense_set.h b/src/theory/arith/arithvar_dense_set.h
deleted file mode 100644
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--- a/src/theory/arith/arithvar_dense_set.h
+++ /dev/null
@@ -1,72 +0,0 @@
-/*********************                                                        */
-/*! \file arithvar_dense_set.h
- ** \verbatim
- ** Original author: taking
- ** Major contributors: mdeters
- ** Minor contributors (to current version): none
- ** This file is part of the CVC4 prototype.
- ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
- ** Courant Institute of Mathematical Sciences
- ** New York University
- ** 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 <vector>
-#include "theory/arith/arith_utilities.h"
-
-
-#ifndef __CVC4__THEORY__ARITH__ARTIHVAR_DENSE_SET_H
-#define __CVC4__THEORY__ARITH__ARTIHVAR_DENSE_SET_H
-
-namespace CVC4 {
-namespace theory {
-namespace arith {
-
-class ArithVarDenseSet {
-private:
-  std::vector<bool> d_set;
-
-public:
-  ArithVarDenseSet() : d_set() {}
-
-  size_t size() const {
-    return d_set.size();
-  }
-
-  void increaseSize(ArithVar max){
-    Assert(max >= size());
-    d_set.resize(max+1, false);
-  }
-
-  bool isMember(ArithVar x) const{
-    return d_set[x];
-  }
-
-  void init(ArithVar x, bool val) {
-    Assert(x >= size());
-    increaseSize(x);
-    d_set[x] = val;
-  }
-
-  void add(ArithVar x){
-    Assert(!isMember(x));
-    d_set[x] = true;
-  }
-
-  void remove(ArithVar x){
-    Assert(isMember(x));
-    d_set[x] = false;
-  }
-};
-
-}; /* namespace arith */
-}; /* namespace theory */
-}; /* namespace CVC4 */
-
-#endif /* __CVC4__THEORY__ARITH__ARTIHVAR_DENSE_SET_H */