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diff --git a/matita/matita/contribs/lambdadelta/ground_2A/xoa/xoa_props.ma b/matita/matita/contribs/lambdadelta/ground_2A/xoa/xoa_props.ma
deleted file mode 100644
index 8ab935a9a..000000000
--- a/matita/matita/contribs/lambdadelta/ground_2A/xoa/xoa_props.ma
+++ /dev/null
@@ -1,22 +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 "basics/logic.ma".
-include "ground_2A/notation/xoa/false_0.ma".
-include "ground_2A/notation/xoa/true_0.ma".
-include "ground_2A/xoa/xoa.ma".
-
-interpretation "logical false" 'false = False.
-
-interpretation "logical true" 'true = True.