>>writegraph3d planar <<
1 0 0 0 2 3 4
2 0 0 0 1 4 8 5
3 0 0 0 1 5 10 6
4 0 0 0 1 6 7 2
5 0 0 0 2 9 10 3
6 0 0 0 3 11 12 4
7 0 0 0 4 12 8
8 0 0 0 2 7 12 9
9 0 0 0 5 8 13 11
10 0 0 0 5 11 3
11 0 0 0 6 10 9 13
12 0 0 0 6 13 8 7
13 0 0 0 11 9 12
0
