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diff --git a/matita/matita/contribs/lambda_delta/basic_2/unfold/csups_csups.ma b/matita/matita/contribs/lambda_delta/basic_2/unfold/csups_csups.ma
deleted file mode 100644
index 1446246c3..000000000
--- a/matita/matita/contribs/lambda_delta/basic_2/unfold/csups_csups.ma
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-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||M||                                                             *)
-(*      ||A||       A project by Andrea Asperti                           *)
-(*      ||T||                                                             *)
-(*      ||I||       Developers:                                           *)
-(*      ||T||         The HELM team.                                      *)
-(*      ||A||         http://helm.cs.unibo.it                             *)
-(*      \   /                                                             *)
-(*       \ /        This file is distributed under the terms of the       *)
-(*        v         GNU General Public License Version 2                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-include "basic_2/unfold/csups.ma".
-
-(* ITERATED SUPCLOSURE ******************************************************)
-
-(* Main propertis ***********************************************************)
-
-theorem csups_trans: bi_transitive … csups.
-/2 width=4/ qed.