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5
2 1 2
3 1 2 3
3 3 4 5
2 4 5

1 2
1 3
3 4
4 5

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

-1

10
5 1 2 3 4 5
5 2 3 4 5 6
5 3 4 5 6 7
5 4 5 6 7 8
5 5 6 7 8 9
5 6 7 8 9 10
5 7 8 9 10 1
5 8 9 10 1 2
5 9 10 1 2 3

1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10