NotReverseElement
\[NotReverseElement]
Alias: !mem. Infix set relation operator. x y is by default interpreted as NotReverseElement[x, y]. See The Mathematica Book: Section 3.10.4. See also: \[ReverseElement] , \[NotElement] .
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\[NotReverseElement]
Alias: 
!mem
y is by default interpreted as NotReverseElement[x, y]. 
