20  0
   1   1  5
   2   1  4
   3   1  -1   -1  0
   4   2  4
   5   2  12
   6   2  11
   7   3  4
   8   3  8
   9   3  -1   0  1
  10   5  7
  11   5  12
  12   6  7
  13   6  10
  14   6  9
  15   7  -1   0  -1
  16   8  10
  17   8  11
  18   9  11
  19   9  12
  20   10  -1   1  0
# Generated by triangle -v diamond_02_00009.node