In Sets, bags, and mixes§

See primary documentation in context for infix ⊈

Returns True if $a is not a subset nor equal to $b, else False. More information, Wikipedia definition.

In Operators§

See primary documentation in context for infix ⊈

multi sub infix:<>($a,$b --> Bool:D)

Not a subset of nor equal to operator.

Returns True if $a is not a subset of $b. Equivalent to !(<=).

say (1,2,3 (2,3,1); # OUTPUT: «False␤» 
say (2,3 (2,3,1);   # OUTPUT: «False␤» 
say 4 !(<=) (1,2,3);   # OUTPUT: «True␤»