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diff --git a/matita/contribs/LAMBDA-TYPES/Unified-Sub/preamble.ma b/matita/contribs/LAMBDA-TYPES/Unified-Sub/preamble.ma
deleted file mode 100644
index d889c3995..000000000
--- a/matita/contribs/LAMBDA-TYPES/Unified-Sub/preamble.ma
+++ /dev/null
@@ -1,34 +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                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-(* Project started Tue Aug 22, 2006 ***************************************)
-
-set "baseuri" "cic:/matita/LAMBDA-TYPES/Unified-Sub/preamble".
-
-(* PREAMBLE
-*)
-
-include "logic/equality.ma".
-include "../../RELATIONAL/datatypes/Bool.ma".
-include "../../RELATIONAL/NPlus/monoid.ma".
-include "../../RELATIONAL/NLE/props.ma".
-include "../../RELATIONAL/NLE/nplus.ma".
-
-axiom f_equal_3: \forall (A,B,C,D:Set).
-                 \forall (f:A \to B \to C \to D). 
-                 \forall (x1,x2:A).
-                 \forall (y1,y2:B).
-                 \forall (z1,z2:C). 
-                 x1 = x2 \to y1 = y2 \to z1 = z2 \to 
-                 f x1 y1 z1 = f x2 y2 z2.