Can there be identical threads in the test?
Like:
4 4
1 2
1 2
2 3
3 4
3
1 2 3
And if they can occur is the answer 2 2 3 or 1 2 3?

My program gives: 1 2 3
I got AC.

It is a web. The web is not a multigraph. All edges will be unique.