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diff --git a/matita/matita/contribs/lambda_delta/basic_2/equivalence/lsubse_ssta.ma b/matita/matita/contribs/lambda_delta/basic_2/equivalence/lsubse_ssta.ma
deleted file mode 100644
index b5dc3f5ac..000000000
--- a/matita/matita/contribs/lambda_delta/basic_2/equivalence/lsubse_ssta.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/computation/xprs_lsubss.ma".
-*)
-include "basic_2/equivalence/lsubse.ma".
-
-(* LOCAL ENVIRONMENT REFINEMENT FOR CONTEXT-SENSITIVE PARALLEL EQUIVALENCE **)
-
-(* Properties on stratified native type assignment **************************)
-
-axiom lsubse_ssta_trans: ∀h,g,L2,T,U2,l. ⦃h, L2⦄ ⊢ T •[g,l] U2 →
-                         ∀L1. h ⊢ L1 ⊢•⊑[g] L2 →
-                         ∃∃U1. ⦃h, L1⦄ ⊢ T •[g,l] U1 & L1 ⊢ U1 ⬌* U2.