Connection table for U73
  18  19  28
 O
 C
 N
 C
 N
 C
 S
 C
 C
 C
 C
 C
 C
 C
 C
 C
 N
 C
   1   2
   2   3
   2  12
   3   4
   4   5
   4   7
   5   6
   6   8
   7   8
   8   9
   9  10
   9  11
  12  13
  13  14
  13  18
  14  15
  15  16
  16  17
  17  18
   1   2   3   4   0.0   5.0
  12   2   3   4 180.0   5.0
   1   2  12  13   0.0   5.0
   3   2  12  13 180.0   5.0
   2   3   4   5 180.0   5.0
   2   3   4   7   0.0   5.0
   3   4   5   6 180.0   5.0
   7   4   5   6   0.0   5.0
   3   4   7   8 180.0   5.0
   5   4   7   8   0.0   5.0
   4   5   6   8   0.0   5.0
   5   6   8   7   0.0   5.0
   5   6   8   9 180.0   5.0
   4   7   8   6   0.0   5.0
   4   7   8   9 180.0   5.0
  12  13  14  15 180.0   5.0
  18  13  14  15   0.0   5.0
  12  13  18  17 180.0   5.0
  14  13  18  17   0.0   5.0
  13  14  15  16   0.0   5.0
  14  15  16  17   0.0   5.0
  15  16  17  18   0.0   5.0
  16  17  18  13   0.0   5.0
   2   1   3  12   0.0   5.0
   4   3   5   7   0.0   5.0
   8   6   7   9   0.0   5.0
   9   8  10  11 -35.0   5.0
  13  12  14  18   0.0   5.0