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diff --git a/matita/matita/contribs/lambdadelta/static_2/notation/relations/subseteq_4.ma b/matita/matita/contribs/lambdadelta/static_2/notation/relations/subseteq_4.ma
index 7b15e417d..1db3bb22d 100644
--- a/matita/matita/contribs/lambdadelta/static_2/notation/relations/subseteq_4.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/notation/relations/subseteq_4.ma
@@ -14,6 +14,6 @@
 
 (* NOTATION FOR THE FORMAL SYSTEM λδ ****************************************)
 
-notation "hvbox( ❪ term 46 L1, break term 46 T1 ❫ ⊆ ❪ break term 46 L2, break term 46 T2 ❫ )"
+notation "hvbox( ❨ term 46 L1, break term 46 T1 ❩ ⊆ ❨ break term 46 L2, break term 46 T2 ❩ )"
    non associative with precedence 45
    for @{ 'SubSetEq $L1 $T1 $L2 $T2 }.