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diff --git a/helm/ocaml/cic_proof_checking/cicMiniReduction.ml b/helm/ocaml/cic_proof_checking/cicMiniReduction.ml
deleted file mode 100644
index 1f6b72636..000000000
--- a/helm/ocaml/cic_proof_checking/cicMiniReduction.ml
+++ /dev/null
@@ -1,74 +0,0 @@
-(* Copyright (C) 2000, 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/.
- *)
-
-let rec letin_nf =
- let module C = Cic in
-  function
-     C.Rel _ as t -> t
-   | C.Var (uri,exp_named_subst) ->
-      let exp_named_subst' =
-       List.map (function (uri,t) -> (uri,letin_nf t)) exp_named_subst
-      in
-       C.Var (uri,exp_named_subst')
-   | C.Meta _ as t -> t
-   | C.Sort _ as t -> t
-   | C.Implicit as t -> t
-   | C.Cast (te,ty) -> C.Cast (letin_nf te, letin_nf ty)
-   | C.Prod (n,s,t) -> C.Prod (n, letin_nf s, letin_nf t)
-   | C.Lambda (n,s,t) -> C.Lambda (n, letin_nf s, letin_nf t)
-   | C.LetIn (n,s,t) -> CicSubstitution.subst (letin_nf s) t
-   | C.Appl l -> C.Appl (List.map letin_nf l)
-   | C.Const (uri,exp_named_subst) ->
-      let exp_named_subst' =
-       List.map (function (uri,t) -> (uri,letin_nf t)) exp_named_subst
-      in
-       C.Const (uri,exp_named_subst')
-   | C.MutInd (uri,typeno,exp_named_subst) ->
-      let exp_named_subst' =
-       List.map (function (uri,t) -> (uri,letin_nf t)) exp_named_subst
-      in
-       C.MutInd (uri,typeno,exp_named_subst')
-   | C.MutConstruct (uri,typeno,consno,exp_named_subst) ->
-      let exp_named_subst' =
-       List.map (function (uri,t) -> (uri,letin_nf t)) exp_named_subst
-      in
-       C.MutConstruct (uri,typeno,consno,exp_named_subst')
-   | C.MutCase (sp,i,outt,t,pl) ->
-      C.MutCase (sp,i,letin_nf outt, letin_nf t, List.map letin_nf pl)
-   | C.Fix (i,fl) ->
-      let substitutedfl =
-       List.map
-        (fun (name,i,ty,bo) -> (name, i, letin_nf ty, letin_nf bo))
-         fl
-      in
-       C.Fix (i, substitutedfl)
-   | C.CoFix (i,fl) ->
-      let substitutedfl =
-       List.map
-        (fun (name,ty,bo) -> (name, letin_nf ty, letin_nf bo))
-         fl
-      in
-       C.CoFix (i, substitutedfl)
-;;