NotSupersetEqual
\[NotSupersetEqual]
Alias: !sup=. Infix set relation operator. x y is by default interpreted as NotSupersetEqual[x, y]. See The Mathematica Book: Section 3.10.4. See also: \[NotSuperset] , \[SupersetEqual] .
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\[NotSupersetEqual]
Alias: 
!sup=
y is by default interpreted as NotSupersetEqual[x, y]. 
