+notation "hvbox( 𝕚 { I } break (term 90 T1) . break (term 90 T) )"
+ non associative with precedence 90
+ for @{ 'SItem $I $T1 $T }.
+
+notation "hvbox( 𝕓 { I } break (term 90 T1) . break (term 90 T) )"
+ non associative with precedence 90
+ for @{ 'SBind $I $T1 $T }.
+
+notation "hvbox( 𝕗 { I } break (term 90 T1) . break (term 90 T) )"