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diff --git a/src/include/prop_engine.h b/src/include/prop_engine.h
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+/*********************                                           -*- C++ -*-  */
+/** prop_engine.h
+ ** This file is part of the CVC4 prototype.
+ **
+ ** The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ **/
+
+#ifndef __CVC4_PROP_ENGINE_H
+#define __CVC4_PROP_ENGINE_H
+
+namespace CVC4 {
+
+// In terms of abstraction, this is below (and provides services to)
+// Prover and above (and requires the services of) a specific
+// propositional solver, DPLL or otherwise.
+
+class PropEngine {
+  DecisionEngine* d_de;
+
+public:
+  /**
+   * Create a PropEngine with a particular decision and theory engine.
+   */
+  PropEngine(DecisionEngine*, TheoryEngine*);
+
+  /**
+   * Converts to CNF if necessary.
+   */
+  void solve(Expr);
+
+};/* class PropEngine */
+
+}
+
+#endif /* __CVC4_PROP_ENGINE_H */