Finding the numbers
##### Submissions: 32017   Accuracy: 34.55%   Difficulty: Easy   Marks: 2

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 :
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 :
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

Example:
Input :

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

Output :
3 4
1 3

#### ** For More Input/Output Examples Use 'Expected Output' option **

Author: Sonesh Shukla

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