Assuming whatever language I'm using has an honest implementation of a set data structure and that these sets of numbers are true sets, and thus, contain no dup

Assuming whatever language I'm using has an honest implementation of a set data structure and that these sets of numbers are true sets, and thus, contain no duplicate values; I would perform an intersection. With Python(my bread and butter), I would simply use the built in intersection set class method: https://docs.python.org/3/library/stdtypes.html?highlight=set#set.intersection https://docs.python.org/3/library/stdtypes.html?highlight=se...