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diff --git a/helm/ocaml/paramodulation/equality_indexing.mli b/helm/ocaml/paramodulation/equality_indexing.mli
deleted file mode 100644
index d7c3bec5e..000000000
--- a/helm/ocaml/paramodulation/equality_indexing.mli
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@@ -1,43 +0,0 @@
-(* Copyright (C) 2005, 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/
- *)
-
-module type EqualityIndex =
-  sig
-    module PosEqSet : Set.S with type elt = Utils.pos * Inference.equality
-    val arities : (Cic.term, int) Hashtbl.t
-    type key = Cic.term
-    type t = Discrimination_tree.DiscriminationTreeIndexing(PosEqSet).t
-    val empty : t
-    val retrieve_generalizations : t -> key -> PosEqSet.t
-    val retrieve_unifiables : t -> key -> PosEqSet.t
-    val init_index : unit -> unit
-    val remove_index : t -> Inference.equality -> t
-    val index : t -> Inference.equality -> t
-    val in_index : t -> Inference.equality -> bool
-  end
-
-module DT : EqualityIndex
-module PT : EqualityIndex
-