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diff --git a/matita/matita/contribs/lambdadelta/ground/etc/relocation/pstream_tl.etc b/matita/matita/contribs/lambdadelta/ground/etc/relocation/pstream_tl.etc
deleted file mode 100644
index 9fa3b818e..000000000
--- a/matita/matita/contribs/lambdadelta/ground/etc/relocation/pstream_tl.etc
+++ /dev/null
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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 "ground/lib/stream_hdtl.ma".
-include "ground/relocation/pstream.ma".
-
-(* RELOCATION P-STREAM ******************************************************)
-
-(* Properties with stream_tl *************************************************)
-
-lemma tl_push: ∀f. f = ⫰⫯f.
-// qed.
-
-lemma tl_next: ∀f. ⫰f = ⫰↑f.
-* // qed.