digraph {
0 -> 4 [label = "1"];
4 -> 6 [label = "-1"];
6 -> 5 [label = "-1"];
5 -> 4 [label = "-1"];
5 -> 3 [label = "-1"];
1 -> 2 [label = "-1"];
0 -> 1 [label = "1"];
2 -> 3 [label = "-1"];
3 -> 1 [label = "-1"];
}