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diff --git a/helm/ocaml/tactics/proofEngineReduction.mli b/helm/ocaml/tactics/proofEngineReduction.mli
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+(* Copyright (C) 2002, HELM Team.
+ * 
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ * 
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ * 
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+exception Impossible of int
+exception ReferenceToConstant
+exception ReferenceToVariable
+exception ReferenceToCurrentProof
+exception ReferenceToInductiveDefinition
+exception WrongUriToInductiveDefinition
+exception RelToHiddenHypothesis
+exception WrongShape
+exception AlreadySimplified
+exception WhatAndWithWhatDoNotHaveTheSameLength;;
+
+val alpha_equivalence: Cic.term -> Cic.term -> bool
+val replace :
+  equality:('a -> Cic.term -> bool) ->
+  what:'a list -> with_what:Cic.term list -> where:Cic.term -> Cic.term
+val replace_lifting :
+  equality:(Cic.term -> Cic.term -> bool) ->
+  what:Cic.term list -> with_what:Cic.term list -> where:Cic.term -> Cic.term
+val replace_lifting_csc :
+  int -> equality:(Cic.term -> Cic.term -> bool) ->
+  what:Cic.term list -> with_what:Cic.term list -> where:Cic.term -> Cic.term
+val reduce : Cic.context -> Cic.term -> Cic.term
+val simpl : Cic.context -> Cic.term -> Cic.term
+val unfold : ?what:Cic.term -> Cic.context -> Cic.term -> Cic.term