Input

The first line is a positive integer t for the number of test cases.
Each test case contains two lines. The first line is an integer n (0<n<=100). The second line contains n integers.

Output

For each test case, outputs the distinct numbers in order in which they were read, seperated by one blank.

Sample Input

2
3
1 2 1
4
2 1 2 1
Sample Output

1 2
2 1

还是不明白，是要用嵌套数组吗？