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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc/cpr/aaa_ltpss_dx.etc b/matita/matita/contribs/lambdadelta/basic_2/etc/cpr/aaa_ltpss_dx.etc
index 2f2d07360..9319cc40e 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/etc/cpr/aaa_ltpss_dx.etc
+++ b/matita/matita/contribs/lambdadelta/basic_2/etc/cpr/aaa_ltpss_dx.etc
@@ -20,7 +20,6 @@ include "basic_2/static/aaa_lift.ma".
 
 (* Properties about dx parallel unfold **************************************)
 
-(* Note: lemma 500 *)
 lemma aaa_ltpss_dx_tpss_conf: ∀L1,T1,A. L1 ⊢ T1 ⁝ A →
                               ∀L2,d,e. L1 ▶* [d, e] L2 →
                               ∀T2. L2 ⊢ T1 ▶* [d, e] T2 → L2 ⊢ T2 ⁝ A.