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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc_2A1/lsubr/lprs_lpss.etc b/matita/matita/contribs/lambdadelta/basic_2/etc_2A1/lsubr/lprs_lpss.etc
new file mode 100644
index 000000000..ed9e7d061
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/basic_2/etc_2A1/lsubr/lprs_lpss.etc
@@ -0,0 +1,24 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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/reduction/lpr_lpss.ma".
+include "basic_2/computation/lprs.ma".
+
+(* SN PARALLEL COMPUTATION ON LOCAL ENVIRONMENTS ****************************)
+
+(* Properties on sn parallel substitution on local environments *************)
+
+lemma lprs_lpss_conf: confluent2 … lprs lpss.
+/3 width=3 by TC_strip1, lpr_lpss_conf/
+qed-.