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diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs_ext.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/cprs_ext.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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+include "basic_2/syntax/cext2.ma".
+include "basic_2/rt_computation/cpms.ma".
+
+(* CONTEXT-SENSITIVE PARALLEL R-COMPUTATION FOR BINDERS *********************)
+
+definition cprs_ext (h) (G): relation3 lenv bind bind ≝
+                             cext2 (λL. cpms h G L 0).
+
+interpretation
+   "context-sensitive parallel r-computation (binder)"
+   'PRedStar h G L I1 I2 = (cprs_ext h G L I1 I2).