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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/etc/unwind2/unwind_prototerm.etc b/matita/matita/contribs/lambdadelta/delayed_updating/etc/unwind2/unwind_prototerm.etc
deleted file mode 100644
index 1a5d46b77..000000000
--- a/matita/matita/contribs/lambdadelta/delayed_updating/etc/unwind2/unwind_prototerm.etc
+++ /dev/null
@@ -1,30 +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/unwind2/unwind.ma".
-include "delayed_updating/syntax/prototerm.ma".
-include "ground/lib/subset_ext.ma".
-
-(* UNWIND FOR PROTOTERM *****************************************************)
-
-interpretation
-  "unwind (prototerm)"
-  'BlackDownTriangle f t = (subset_ext_f1 ? ? (unwind_gen ? proj_path f) t).
-
-(* Basic constructions ******************************************************)
-
-lemma in_comp_unwind_bi (f) (p) (t):
-      p ϵ t → ▼[f]p ϵ ▼[f]t.
-/2 width=1 by subset_in_ext_f1_dx/
-qed.