NotElement
\[NotElement]
Alias: !elem. Infix set relation operator. x y is by default interpreted as NotElement[x, y]. See The Mathematica Book: Section 1.10.8 and Section 3.10.4. See also: \[Element] , \[NotReverseElement] .
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\[NotElement]
Alias: 
!elem
y is by default interpreted as NotElement[x, y]. 
