Bitwise - XOR operation - number only appears once - given a non-empty array of integers, once, the rest of each element appears twice in addition to an element occurs only. Only to find out that there was once an element

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Bitwise - XOR operation - number only appears once - given a non-empty array of integers, once, the rest of each element appears twice in addition to an element occurs only. Only to find out that there was once an element

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