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diff --git a/matita/contribs/LAMBDA-TYPES/LambdaDelta-1/drop/defs.ma b/matita/contribs/LAMBDA-TYPES/LambdaDelta-1/drop/defs.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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 "LambdaDelta-1/C/defs.ma".
+
+include "LambdaDelta-1/lift/defs.ma".
+
+include "LambdaDelta-1/r/defs.ma".
+
+inductive drop: nat \to (nat \to (C \to (C \to Prop))) \def
+| drop_refl: \forall (c: C).(drop O O c c)
+| drop_drop: \forall (k: K).(\forall (h: nat).(\forall (c: C).(\forall (e: 
+C).((drop (r k h) O c e) \to (\forall (u: T).(drop (S h) O (CHead c k u) 
+e))))))
+| drop_skip: \forall (k: K).(\forall (h: nat).(\forall (d: nat).(\forall (c: 
+C).(\forall (e: C).((drop h (r k d) c e) \to (\forall (u: T).(drop h (S d) 
+(CHead c k (lift h (r k d) u)) (CHead e k u)))))))).
+