Given an array where every element appears twice except a pair (two elements). Find the elements of this unique pair.
The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. Each test case consists of two lines. First line of each test case contains an Integer N denoting size of array and the second line contains N space separated elements.
For each test case, in new line print the unique pair in increasing order.
2 2 5 5 6 7
1 3 4 1
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