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diff --git a/matita/matita/contribs/lambda_delta/basic_2/static/lsuba_aaa.ma b/matita/matita/contribs/lambda_delta/basic_2/static/lsuba_aaa.ma
deleted file mode 100644
index 66e802aae..000000000
--- a/matita/matita/contribs/lambda_delta/basic_2/static/lsuba_aaa.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/static/aaa_aaa.ma".
-include "basic_2/static/lsuba_ldrop.ma".
-
-(* LOCAL ENVIRONMENT REFINEMENT FOR ATOMIC ARITY ASSIGNMENT *****************)
-
-(* Properties concerning atomic arity assignment ****************************)
-
-lemma lsuba_aaa_conf: ∀L1,V,A. L1 ⊢ V ⁝ A → ∀L2. L1 ⁝⊑ L2 → L2 ⊢ V ⁝ A.
-#L1 #V #A #H elim H -L1 -V -A
-[ //
-| #I #L1 #K1 #V1 #B #i #HLK1 #HV1B #IHV1 #L2 #HL12
-  elim (lsuba_ldrop_O1_conf … HL12 … HLK1) -L1 #X #H #HLK2
-  elim (lsuba_inv_pair1 … H) -H * #K2
-  [ #HK12 #H destruct /3 width=5/
-  | #V2 #A1 #HV1A1 #HV2 #_ #H1 #H2 destruct
-    >(aaa_mono … HV1B … HV1A1) -B -HV1A1 /2 width=5/
-  ]
-| /4 width=2/
-| /4 width=1/
-| /3 width=3/
-| /3 width=1/
-]
-qed.
-
-lemma lsuba_aaa_trans: ∀L2,V,A. L2 ⊢ V ⁝ A → ∀L1. L1 ⁝⊑ L2 → L1 ⊢ V ⁝ A.
-#L2 #V #A #H elim H -L2 -V -A
-[ //
-| #I #L2 #K2 #V2 #B #i #HLK2 #HV2B #IHV2 #L1 #HL12
-  elim (lsuba_ldrop_O1_trans … HL12 … HLK2) -L2 #X #H #HLK1
-  elim (lsuba_inv_pair2 … H) -H * #K1
-  [ #HK12 #H destruct /3 width=5/
-  | #V1 #A1 #HV1 #HV2A1 #_ #H1 #H2 destruct
-    >(aaa_mono … HV2B … HV2A1) -B -HV2A1 /2 width=5/
-  ]
-| /4 width=2/
-| /4 width=1/
-| /3 width=3/
-| /3 width=1/
-]
-qed.