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diff --git a/helm/software/matita/contribs/ng_assembly/freescale/bool.ma b/helm/software/matita/contribs/ng_assembly/freescale/bool.ma
deleted file mode 100755
index e7ea4dcfa..000000000
--- a/helm/software/matita/contribs/ng_assembly/freescale/bool.ma
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@@ -1,78 +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                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-(* ********************************************************************** *)
-(*                          Progetto FreeScale                            *)
-(*                                                                        *)
-(*   Sviluppato da: Cosimo Oliboni, oliboni@cs.unibo.it                   *)
-(*     Cosimo Oliboni, oliboni@cs.unibo.it                                *)
-(*                                                                        *)
-(* ********************************************************************** *)
-
-include "freescale/pts.ma".
-
-(* ******** *)
-(* BOOLEANI *)
-(* ******** *)
-
-ninductive bool : Type ≝ 
-  true : bool
-| false : bool.
-
-(* operatori booleani *)
-
-ndefinition eq_bool ≝
-λb1,b2:bool.match b1 with
- [ true ⇒ match b2 with [ true ⇒ true | false ⇒ false ]
- | false ⇒ match b2 with [ true ⇒ false | false ⇒ true ]
- ].
-
-ndefinition not_bool ≝
-λb:bool.match b with [ true ⇒ false | false ⇒ true ].
-
-ndefinition and_bool ≝
-λb1,b2:bool.match b1 with
- [ true ⇒ b2 | false ⇒ false ].
-
-ndefinition or_bool ≝
-λb1,b2:bool.match b1 with
- [ true ⇒ true | false ⇒ b2 ].
-
-ndefinition xor_bool ≝
-λb1,b2:bool.match b1 with
- [ true ⇒ not_bool b2
- | false ⇒ b2 ].
-
-(* \ominus *)
-notation "hvbox(⊖ a)" non associative with precedence 36
- for @{ 'not_bool $a }.
-interpretation "not_bool" 'not_bool x = (not_bool x).
-
-(* \otimes *)
-notation "hvbox(a break ⊗ b)" left associative with precedence 35
- for @{ 'and_bool $a $b }.
-interpretation "and_bool" 'and_bool x y = (and_bool x y).
-
-(* \oplus *)
-notation "hvbox(a break ⊕ b)" left associative with precedence 34
- for @{ 'or_bool $a $b }.
-interpretation "or_bool" 'or_bool x y = (or_bool x y).
-
-(* \odot *)
-notation "hvbox(a break ⊙ b)" left associative with precedence 33
- for @{ 'xor_bool $a $b }.
-interpretation "xor_bool" 'xor_bool x y = (xor_bool x y).
-
-ndefinition boolRelation : Type → Type ≝
-λA:Type.A → A → bool.