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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc/ssta1/cpds_lift.etc b/matita/matita/contribs/lambdadelta/basic_2/etc/ssta1/cpds_lift.etc
deleted file mode 100644
index b35ebad49..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/etc/ssta1/cpds_lift.etc
+++ /dev/null
@@ -1,35 +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/unfold/lsstas_lift.ma".
-include "basic_2/computation/cprs_lift.ma".
-include "basic_2/computation/cpds.ma".
-
-(* DECOMPOSED EXTENDED PARALLEL COMPUTATION ON TERMS ************************)
-
-(* Relocation properties ****************************************************)
-
-lemma cpds_lift: ∀h,g,G. l_liftable (cpds h g G).
-#h #g #G #K #T1 #T2 * #T #l1 #l2 #Hl12 #Hl1 #HT1 #HT2 #L #s #d #e
-elim (lift_total T d e)
-/3 width=16 by cprs_lift, da_lift, lsstas_lift, ex4_3_intro/
-qed.
-
-lemma cpds_inv_lift1: ∀h,g,G. l_deliftable_sn (cpds h g G).
-#h #g #G #L #U1 #U2 * #U #l1 #l2 #Hl12 #Hl1 #HU1 #HU2 #K #s #d #e #HLK #T1 #HTU1
-lapply (da_inv_lift … Hl1 … HLK … HTU1) -Hl1 #Hl1
-elim (lsstas_inv_lift1 … HU1 … HLK … HTU1) -U1 #T #HTU #HT1
-elim (cprs_inv_lift1 … HU2 … HLK … HTU) -U -L
-/3 width=9 by ex4_3_intro, ex2_intro/
-qed-.