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Given an array of integers, where all distinct element appears twice except one, call it the singular.
For example, in [0，0，1，1，2，3，3], 2 is the singular. Write a function to return the singular. Note there is only one singular.
Given an array of integers, where all distinct element appears twice except one, call it the singular.
For example, in [0，0，1，1，2，3，3], 2 is the singular. Write a function to return the singular. Note there is only one singular.
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