digraph foo {
rankdir = LR;
s;
1;
2;
3;
4;
5;
6;
t;
s->1 [label="12 / 0,15"];
s->3 [label="8 / 0,13"];
1->2 [label="4 / 10,10"];
1->4 [label="8 / 15,8"];
1->3 [label="0 / 20,5"];
2->4 [label="0 / 5,10"];
2->t [label="4 / 0,7"];
3->4 [label="4 / 20,5"];
3->5 [label="0 / 10,4"];
3->6 [label="4 / 25,5"];
4->6 [label="8 / 0,8"];
4->t [label="4 / 0,5"];
5->6 [label="0 / 15,6"];
5->t [label="0 / 0,2"];
6->t [label="12 / 0,14"];
};