Finding the numbers

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Problem statement

You are given an array A containing 2*N+2 positive numbers, out of which 2*N numbers exist in pairs whereas the other two number occur exactly once and are distinct. You need to find the other two numbers and print them in ascending order.

Input format

The first line contains a value T, which denotes the number of test cases. Then T test cases follow .The first line of each test case contains a value N. The next line contains 2*N+2 space separated integers.

Output format

Print in a new line the two numbers in ascending order.

Constraints

1<=T<=100 1<=N<=10^6 1<=A[i]<=5*10^8

Sample Input 1

2
2
1 2 3 2 1 4
1
2 1 3 2

Sample output 1

3 4
1 3

Explanation

N/A

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