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Is it true that for all subsets A and B of a set U, there is...

Is it true that for all subsets A and B of a set U, there is a subset X of U for which A△X⊆B△X? If there is such an X, then prove it (in particular, say what X can be, and prove your assertion); if there can fail to be such an X, then give an example where there is no such X.

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