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+(***********************************************************************)
+(* v * The Coq Proof Assistant / The Coq Development Team *)
+(* <O___,, * INRIA-Rocquencourt & LRI-CNRS-Orsay *)
+(* \VV/ *************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(***********************************************************************)
+
+(*i $Id$ i*)
+
+(*i*)
+open Names
+open Term
+open Proof_type
+(*i*)
+
+val absurd : constr -> tactic
+val contradiction_on_hyp : identifier -> tactic
+val contradiction : tactic