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$->s[ ; a function taking an argument s <=s ; duplicate s last ; last letter in s .. ; range s\0 ; first letter in s @ ; reify range -- ; set difference (between the range and duplicated s) ] ; end function
$->s[ ; a function taking an argument s <=s ; duplicate s last ; last letter in s .. ; range s\0 ; first letter in s @ ; reify range -- ; set difference (between the range and duplicated s) ] ; end function
