>>writegraph3d planar <<
1 0 0 0 2 3 7 4
2 0 0 0 1 5 10 3
3 0 0 0 1 2 11 6
4 0 0 0 1 8 5
5 0 0 0 2 4 13 9
6 0 0 0 3 12 7
7 0 0 0 1 6 14 8
8 0 0 0 4 7 14 13
9 0 0 0 5 13 16 10
10 0 0 0 2 9 11
11 0 0 0 3 10 16 12
12 0 0 0 6 11 16 14
13 0 0 0 8 15 9 5
14 0 0 0 12 15 8 7
15 0 0 0 13 14 16
16 0 0 0 9 15 12 11
0
