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diff --git a/src/decision/decision_mode.cpp b/src/decision/decision_mode.cpp
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+/*********************                                                        */
+/*! \file decision_mode.cpp
+ ** \verbatim
+ ** Original author: mdeters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009-2012  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 "decision/decision_mode.h"
+
+namespace CVC4 {
+
+std::ostream& operator<<(std::ostream& out, decision::DecisionMode mode) {
+  switch(mode) {
+  case decision::DECISION_STRATEGY_INTERNAL:
+    out << "DECISION_STRATEGY_INTERNAL";
+    break;
+  case decision::DECISION_STRATEGY_JUSTIFICATION:
+    out << "DECISION_STRATEGY_JUSTIFICATION";
+    break;
+  default:
+    out << "DecisionMode:UNKNOWN![" << unsigned(mode) << "]";
+  }
+
+  return out;
+}
+
+}/* CVC4 namespace */
+