4
3 3 3
1 2 -1
2 3 -1
1 3 -1
0 1 1
3 2 3
1 2 -1
2 3 -1
0 1 2
3 3 3
1 2 -1
2 3 -1
1 3 -1
0 1 2
3 3 3
1 2 1
2 3 1
1 3 1
0 1 2
