2 For an arbitrary set of numbers S define S S to be the set of all sums x y where and y are in S Let A B C D be sets of

Question

2 For an arbitrary set of numbers S define S S to be the set of all sums x y where and y are in S Let A B C D be sets of integers such that AUB AUB CUD CUD For example if AB C D 1 2 then AUB AUB CUD CUD 1 1 1 2 2 1 2 2 2 3 4 1

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