NotSubset
\[NotSubset]
Alias: !sub. Infix set relation operator. x y is by default interpreted as NotSubset[x, y]. See The Mathematica Book: Section 3.10.4. See also: \[NotSubsetEqual] , \[Subset] .
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\[NotSubset]
Alias: 
!sub
y is by default interpreted as NotSubset[x, y]. 
