>>writegraph3d planar <<
1 0 0 0 2 3 4
2 0 0 0 1 5 8 3
3 0 0 0 1 2 8 6
4 0 0 0 1 6 5
5 0 0 0 2 4 10 7
6 0 0 0 3 9 10 4
7 0 0 0 5 11 9 8
8 0 0 0 2 7 9 3
9 0 0 0 6 8 7 11
10 0 0 0 6 11 5
11 0 0 0 7 10 9
0
