3
4 7
0 1
2 0
0 2
3 0
1 3
2 3
3 3
4 6
0 1
2 0
0 3
1 2
3 1
2 3
6 10
0 3
1 2
4 0
5 1
4 4
2 3
3 1
3 2
1 4
1 5