# type topo
# cell     2.500000     2.500000     1.000000    90.000000    90.000000   120.000000
6
  1 v      0.000000    0.866025    0.250000   0                             5/13      5/12      1/14      1/12      3/13       6/3       6/4      2/13 
  2 v      0.500000    1.732051    0.250000   0                             1/13      6/16      6/15      2/14      2/12      3/13      4/13      4/12 
  3 v     -0.500000    1.732051    0.250000   0                             1/13      2/13      5/16      5/15      3/14      3/12       4/3       4/4 
  4 v      1.250000    1.299038    0.750000   0                             2/13      2/14      3/23      3/22      6/13      4/14      4/12      5/13 
  5 v      0.750000    0.433013    0.750000   0                             1/13      1/14      3/10      3/11      4/13      6/13      5/14      5/12 
  6 v      1.750000    0.433013    0.750000   0                             1/23      1/22      2/10      2/11      4/13      5/13      6/14      6/12