>>writegraph3d planar <<
1 0 0 0 2 3 4
2 0 0 0 1 5 8 3
3 0 0 0 1 2 9 6
4 0 0 0 1 6 10 5
5 0 0 0 2 4 11 7
6 0 0 0 3 9 4
7 0 0 0 5 11 8
8 0 0 0 2 7 12 9
9 0 0 0 3 8 10 6
10 0 0 0 4 9 12 11
11 0 0 0 5 10 12 7
12 0 0 0 11 10 8
0
