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diff --git a/matita/matita/contribs/lambdadelta/basic_2/s_computation/fqus_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/s_computation/fqus_drops.ma
deleted file mode 100644
index cfcecbb00..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/s_computation/fqus_drops.ma
+++ /dev/null
@@ -1,26 +0,0 @@
-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||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/s_computation/fqup_drops.ma".
-include "basic_2/s_computation/fqus_fqup.ma".
-
-(* STAR-ITERATED SUPCLOSURE *************************************************)
-
-(* Properties with generic slicing for local environments *******************)
-
-lemma fqus_drops: ∀b,G,L,K,T,U,i. ⬇*[i] L ≘ K → ⬆*[i] T ≘ U →
-                  ⦃G, L, U⦄ ⊐*[b] ⦃G, K, T⦄.
-#b #G #L #K #T #U * /3 width=3 by fqup_drops_succ, fqup_fqus/
-#HLK #HTU <(lifts_fwd_isid … HTU) -U // <(drops_fwd_isid … HLK) -K //
-qed.