20  3  0
   0       8     6     7
   1      11     7    12
   2      10     7    11
   3       5     8     9
   4       8     5     6
   5       9    10     4
   6       9     8     7
   7       7    10     9
   8       5     9     4
   9      11     3    10
  10      12     3    11
  11      12     0    13
  12      13     1    14
  13       1    13     0
  14      12    13     3
  15       4    10     3
  16      14     2     3
  17       2    14     1
  18       3    13    14
  19       7     0    12
# Generated by Q:/sequin/public_html/GEN/EscherSphere/lib/triangle -pe es_tri.poly