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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc/cpre/cpre_cpre.etc b/matita/matita/contribs/lambdadelta/basic_2/etc/cpre/cpre_cpre.etc
deleted file mode 100644
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--- a/matita/matita/contribs/lambdadelta/basic_2/etc/cpre/cpre_cpre.etc
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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/computation/cprs_cprs.ma".
-include "basic_2/computation/cpre.ma".
-
-(* EVALUATION FOR CONTEXT-SENSITIVE PARALLEL REDUCTION ON TERMS *************)
-
-(* Main properties *********************************************************)
-
-(* Basic_1: was: nf2_pr3_confluence *)
-theorem cpre_mono: ∀G,L,T,T1. ⦃G, L⦄ ⊢ T ➡* 𝐍⦃T1⦄ → ∀T2. ⦃G, L⦄ ⊢ T ➡* 𝐍⦃T2⦄ → T1 = T2.
-#G #L #T #T1 * #H1T1 #H2T1 #T2 * #H1T2 #H2T2
-elim (cprs_conf … H1T1 … H1T2) -T #T #HT1
->(cprs_inv_cnr1 … HT1 H2T1) -T1 #HT2
->(cprs_inv_cnr1 … HT2 H2T2) -T2 //
-qed-.