input:

2
6 9
1 2
1 3
1 4
2 3
2 4
3 4
4 5
4 6
4 6
3 4
1 3
2 3
3 3
1 2

output:

Yes
1 2
1 3
1 4
4 5
4 6
Yes
1 2
1 3

result:

wrong answer case 2, paticipant's deg[1] = 2 is too large