In Operators§
See primary documentation in context for infix ⊈.
multi 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»