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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cpms_cnh.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cpms_cnh.ma
deleted file mode 100644
index 8cd6df24a..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cpms_cnh.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 "static_2/syntax/theq_theq.ma".
-include "basic_2/rt_transition/cnh_cnh.ma".
-include "basic_2/rt_computation/cpms.ma".
-
-(* T-BOUND CONTEXT-SENSITIVE PARALLEL RT-COMPUTATION FOR TERMS **************)
-
-(* Inversion lemmas with normal terms for head t-unbound rt-transition ******)
-
-lemma cpms_inv_cnh_sn (h) (n) (G) (L):
-      ∀T1,T2. ⦃G,L⦄ ⊢ T1 ➡*[n,h] T2 → ⦃G,L⦄ ⊢ ⥲[h] 𝐍⦃T1⦄ → T1 ⩳ T2.
-#h #n #G #L #T1 #T2 #H @(cpms_ind_sn … H) -T1 //
-#n1 #n2 #T1 #T0 #HT10 #_ #IH #HT1
-/4 width=9 by cnh_cpm_trans, theq_trans/
-qed-.