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diff --git a/matita/matita/contribs/LAMBDA-TYPES/Basic-1/nf2/defs.ma b/matita/matita/contribs/LAMBDA-TYPES/Basic-1/nf2/defs.ma
new file mode 100644
index 000000000..98e931c0b
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+++ b/matita/matita/contribs/LAMBDA-TYPES/Basic-1/nf2/defs.ma
@@ -0,0 +1,31 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+(* This file was automatically generated: do not edit *********************)
+
+include "Basic-1/pr2/defs.ma".
+
+definition nf2:
+ C \to (T \to Prop)
+\def
+ \lambda (c: C).(\lambda (t1: T).(\forall (t2: T).((pr2 c t1 t2) \to (eq T t1 
+t2)))).
+
+definition nfs2:
+ C \to (TList \to Prop)
+\def
+ let rec nfs2 (c: C) (ts: TList) on ts: Prop \def (match ts with [TNil 
+\Rightarrow True | (TCons t ts0) \Rightarrow (land (nf2 c t) (nfs2 c ts0))]) 
+in nfs2.
+