Common Elements Across Sorted Arrays

You are given an integer T representing the number of test cases. For each test case, you are given an integer K representing the number of sorted arrays. Following this, for each of the K arrays, the first line contains an integer N indicating the number of elements in the array, and the next line contains N space-separated integers sorted in non-decreasing order.

Your task is to find all unique common elements that appear in every one of the K arrays. If there are common elements, print them in ascending order separated by a single space. If there are no common elements, output No common elements!.

Note: The input is read from standard input (stdin) and the output should be written to standard output (stdout).

inputFormat

The first line of input contains an integer T, the number of test cases. For each test case, the first line contains an integer K representing the number of arrays. Then, for each of the K arrays, the first line contains an integer N (the size of the array) followed by a second line with N space-separated integers in sorted order.

outputFormat

For each test case, print a single line containing the common elements in ascending order separated by a space. If there are no common elements, print No common elements!.## sample

4
3
5
1 2 3 4 5
4
2 4 6 8
4
0 2 4 6
2
4
1 4 5 6
4
6 7 8 9
3
3
1 2 3
3
2 3 4
3
0 2 3
3
3
1 2 3
3
4 5 6
3
7 8 9

2 4
6
2 3
No common elements!