Symmetric difference

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Given two sets A and B, compute $(A \setminus B) \cup (B \setminus A).$ That is, enumerate the items that are in A or B but not both. This set is called the symmetric difference of A and B. In other words: $(A \cup B) \setminus (A \cap B)$ (the set of items that are in at least one of A or B minus the set of items that are in both A and B).

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