input:

7
1 7 8
1 3
2 3
6 4
3 4
3 5
6 7
5 7
4 7
2 20 19
1 3
2 3
3 7
4 6
5 6
6 7
8 9
7 9
9 10
11 13
12 13
13 14
15 17
16 17
17 14
14 10
10 19
18 19
19 20
3 10 9
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
4 10 9
2 3
4 5
8 9
9 10
1 2
6 7
5 6
7 8
3 4
5 13 16
1 12
12 9
9 11
11 13
2 4
4 8
8 12
8 7
9 10
10 11
7 10
4 5
5...

output:

1 3
2 4
3 1
4 1
5 4
6 1
7 1

result:

wrong answer 5th lines differ - expected: '5 3', found: '5 4'