12  3  0
   1       1     3     2
   2       4     3     5
   3       2     4     9
   4       4     2     3
   5       3     1     6
   6       6     8     7
   7       8     6     1
   8       7     9     4
   9       7     5     6
  10       9     7     8
  11       7     4     5
  12       6     5     3
# Generated by triangle -v diamond_02_00009.node