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diff --git a/components/cic_unification/cicMkImplicit.mli b/components/cic_unification/cicMkImplicit.mli
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+(* Copyright (C) 2004, 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://helm.cs.unibo.it/
+ *)
+
+
+(* identity_relocation_list_for_metavariable i canonical_context         *)
+(* returns the identity relocation list, which is the list               *)
+(* [Rel 1 ; ... ; Rel n] where n = List.length [canonical_context]       *)
+val identity_relocation_list_for_metavariable :
+  ?start: int -> 'a option list -> Cic.term option list
+
+(* Returns the first meta whose number is above the *)
+(* number of the higher meta.                       *)
+val new_meta : Cic.metasenv -> Cic.substitution -> int
+
+(** [mk_implicit metasenv context]
+ * add a fresh metavariable to the given metasenv, using given context
+ * @return the new metasenv and the index of the added conjecture *)
+val mk_implicit: Cic.metasenv -> Cic.substitution -> Cic.context -> Cic.metasenv * int
+
+(** as above, but the fresh metavariable represents a type *)
+val mk_implicit_type: Cic.metasenv -> Cic.substitution -> Cic.context -> Cic.metasenv * int
+
+(** as above, but the fresh metavariable represents a sort *)
+val mk_implicit_sort: Cic.metasenv -> Cic.substitution -> Cic.metasenv * int
+
+(** [mk_implicit metasenv context] create n fresh metavariables *)
+val n_fresh_metas:  
+  Cic.metasenv -> Cic.substitution -> Cic.context -> int -> Cic.metasenv * Cic.term list
+
+(** [fresh_subst metasenv context uris] takes in input a list of uri and
+creates a fresh explicit substitution *)
+val fresh_subst:  
+  Cic.metasenv -> 
+    Cic.substitution ->
+      Cic.context -> 
+        UriManager.uri list -> 
+          Cic.metasenv * (Cic.term Cic.explicit_named_substitution)
+