12  1
    0      0     2     1    -1
    1      6     4     5    -1
    2      2     0     3    -1
    3      0     5     4    -1
    4      4     6     7    -1
    5      1     6     5    -1
    6      5     0     1    -1
    7      2     7     6    -1
    8      6     1     2    -1
    9      7     0     4    -1
   10      7     2     3    -1
   11      0     7     3    -1
# Generated by tetgen -pq prism.poly