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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cpue_csx.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cpue_csx.ma
deleted file mode 100644
index 2ba2ddb02..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cpue_csx.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/rt_transition/cpm_cpx.ma".
-include "basic_2/rt_transition/cnu_tdeq.ma".
-include "basic_2/rt_computation/csx.ma".
-include "basic_2/rt_computation/cpue.ma".
-
-(* EVALUATION FOR T-UNBOUND RT-TRANSITION ON TERMS **************************)
-
-(* Properties with strong normalization for unbound rt-transition for terms *)
-
-lemma cpue_total_csx (h) (G) (L):
-      ∀T1. ⦃G,L⦄ ⊢ ⬈*[h] 𝐒⦃T1⦄ → ∃T2. ⦃G,L⦄ ⊢ T1 ⥲*[h] 𝐍⦃T2⦄.
-#h #G #L #T1 #H
-@(csx_ind … H) -T1 #T1 #_ #IHT1
-elim (cnu_dec_tdeq h G L T1) [ /3 width=4 by ex2_intro, ex_intro/ ] *
-#n1 #T0 #HT10 #HnT10
-elim (IHT1 … HnT10) -IHT1 -HnT10 [| /2 width=2 by cpm_fwd_cpx/ ]
-#T2 * #n2 #HT02 #HT2 /4 width=7 by cpms_step_sn, ex2_intro, ex_intro/
-qed-.