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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/etc/unwind3/unwind_lift.etc b/matita/matita/contribs/lambdadelta/delayed_updating/etc/unwind3/unwind_lift.etc
deleted file mode 100644
index 9530004ca..000000000
--- a/matita/matita/contribs/lambdadelta/delayed_updating/etc/unwind3/unwind_lift.etc
+++ /dev/null
@@ -1,32 +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 "delayed_updating/unwind3/unwind_structure.ma".
-include "delayed_updating/substitution/lift_structure.ma".
-
-(* UNWIND FOR PATH **********************************************************)
-
-(* Constructions with lift **************************************************)
-
-lemma pippo (p) (n:pnat) (f):
-      ↑[𝐮❨n❩]▼[⇂*[n]f]p = ▼[𝐮❨n❩∘f]p.
-#p @(list_ind_rcons … p) -p //
-#p * [ #m ] #IH #n #f //
-[
-| <unwind_path_m_dx
-
- //
-<depth_d_dx >list_cons_shift <list_append_assoc <unwind_rmap_d_dx
-/3 width=3 by tr_tls_compose_uni_sn, stream_eq_trans/
-qed.