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⊉
Combined from primary sources listed below.

In Sets, bags, and mixes§

See primary documentation in context for infix ⊉.

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

In Operators§

See primary documentation in context for infix ⊉. 

multi infix:<⊉>($a,$b --> Bool:D)

Not a superset of nor equal to operator.

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

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