Documentation for infix ⊄ assembled from the following types:

language documentation Operators

From Operators

(Operators) infix ⊄

multi sub infix:<⊄>($a,$b --> Bool:D)

Not a subset of operator.

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

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

⊄ is codepoint U+2284 (NOT A SUBSET OF).

language documentation Sets, bags, and mixes

From Sets, bags, and mixes

(Sets, bags, and mixes) infix ⊄

Returns True if $a is not a strict subset of $b, else False. More information, Wikipedia definition.