4 5 7
2
0 1
1 2
2
2 3
1 3
2
0 1
0 3
4
0 1
1 2
0 3
2 3
1
1 3
1 1 1
2 2 2
3 3 3
0 0 5
2 1 3
1 1 4
3 2 3
