Scan First: for _ in range(int(input())): a=[] for i in range(int(input())): z=int(input()) if z not in a: a.append(z) else: a.remove(z) for i in a: print(i)
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for _ in range(int(input())): a=[] for i in range(int(input())): z=int(input()) if z not in a: a.append(z) else: a.remove(z) for i in a: print(i)
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