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diff --git a/helm/matita/contribs/LAMBDA-TYPES/terms_defs.ma b/helm/matita/contribs/LAMBDA-TYPES/terms_defs.ma
new file mode 100644
index 000000000..3f93fc13d
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@@ -0,0 +1,38 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+set "baseuri" "cic:/matita/LAMBDA-TYPES/terms_defs".
+
+inductive B : Set \def 
+   | Void: B
+   | Abbr: B
+   | Abst: B.
+
+inductive F : Set \def 
+   | Appl: F 
+   | Cast: F.
+
+inductive W : Set \def 
+   | Bind: B \to W 
+   | Flat: F \to W.
+
+inductive T (A:Set) (N:Set) : Set \def
+   | TSort: A \to nat \to (T A N) 
+   | TLRef: A \to nat \to (T A N)
+   | TWag : A \to W \to (T A N) \to (T A N) \to (T A N)
+   | TGRef: A \to N \to (T A N).
+   
+record X (A:Set) (N:Set) : Type \def {
+   get_gref: N \to B \to (T A N) \to Prop
+}.