>>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 11 5
5 0 0 0 2 4 12 7
6 0 0 0 3 10 11 4
7 0 0 0 5 13 16 8
8 0 0 0 2 7 16 9
9 0 0 0 3 8 10
10 0 0 0 6 9 16 14
11 0 0 0 6 14 12 4
12 0 0 0 5 11 13
13 0 0 0 7 12 14 15
14 0 0 0 10 15 13 11
15 0 0 0 13 14 16
16 0 0 0 7 15 10 8
0
