# type topo
# cell     3.185100     3.185100     1.633000    90.000000    90.000000   120.000000
18
  1 v      0.577459    0.000000    0.408250   0                             2/13       3/1      6/13       8/9     11/10      11/9     12/12     12/13 
  2 v     -0.288729    0.500094    0.408250   0                             1/13       3/1       4/4      9/12      10/3      10/4     12/13     12/12 
  3 v      1.303821    2.258284    0.408250   0                             1/25      2/25      5/13      7/12     10/16     10/15     11/22     11/21 
  4 v      2.170009    0.919459    0.952583   0                             2/22      5/13      6/13      9/22     14/13     14/14     15/13     15/14 
  5 v      1.303821    1.419553    0.952583   0                             3/13      4/13      6/13      7/13     13/13     13/14     15/13     15/14 
  6 v      1.303821    0.419365    0.952583   0                             1/13      4/13      5/13      8/10     13/13     13/14     14/13     14/14 
  7 v      0.577459    1.838918    1.496917   0                             3/14      5/13      8/13      9/13     17/14     17/13     18/14     18/13 
  8 v     -0.288729    2.339012    1.496917   0                             1/17      6/16      7/13      9/13     16/14     16/13     18/14     18/13 
  9 v     -0.288729    1.338824    1.496917   0                             2/14       4/4      7/13      8/13     16/13     16/14     17/14     17/13 
 10 v      2.607641    0.000000    1.224750   0                             2/23      2/22      3/10      3/11     11/19     12/22     14/14     18/10 
 11 v     -1.303821    2.258284    1.224750   0                             1/16      1/17       3/4       3/5      10/7     12/16      15/5     16/13 
 12 v      0.288729    0.500094    1.224750   0                             1/14      1/13      2/13      2/14      10/4     11/10     13/14     17/13 
 13 v      1.015091    0.919459    0.136083   0                             5/13      5/12      6/13      6/12     12/12     14/13     15/13     17/13 
 14 v      1.881279    0.419365    0.136083   0                             4/13      4/12      6/13      6/12     10/12     13/13     15/13     18/10 
 15 v      1.881279    1.419553    0.136083   0                             4/13      4/12      5/13      5/12     11/21     13/13     14/13     16/22 
 16 v     -0.577459    1.838918    0.680417   0                             8/12      8/13      9/13      9/12     11/13      15/4     17/13     18/13 
 17 v      0.288729    1.338824    0.680417   0                             7/12      7/13      9/12      9/13     12/13     13/13     16/13     18/13 
 18 v      0.288729    2.339012    0.680417   0                             7/12      7/13      8/12      8/13     10/16     14/16     16/13     17/13