>>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 12 5
5 0 0 0 2 4 12 7
6 0 0 0 3 10 11 4
7 0 0 0 5 11 9 8
8 0 0 0 2 7 9
9 0 0 0 3 8 7 10
10 0 0 0 6 9 11
11 0 0 0 6 10 7 12
12 0 0 0 4 11 5
0
