>>writegraph3d planar <<
1 0 0 0 2 3 7 4
2 0 0 0 1 4 5
3 0 0 0 1 5 8 6
4 0 0 0 1 5 2
5 0 0 0 2 4 7 3
6 0 0 0 3 8 7
7 0 0 0 1 6 8 5
8 0 0 0 3 7 6
0
