12345678910111213 *Vertices 51 A2 B3 C4 D*Arcs1 2 01 3 13 2 13 4 14 2 14 3 1
*Vertices 5
1 A
2 B
3 C
4 D
*Arcs
1 2 0
1 3 1
3 2 1
3 4 1
4 2 1
4 3 1