Connection table for 2BL
  20  21  28
 C
 C
 C
 C
 C
 C
 C
 C
 C
 C
 C
 C
 C
 O
 O
 O
 O
 O
 S
 N
   1   2
   1  14
   1  20
   2   3
   2   5
   3   4
   3  20
   4  15
   4  16
   5   6
   7   8
   7   9
   7  19
   8  10
   9  11
  10  12
  11  12
  12  13
  17  19
  18  19
  19  20
  14   1   2   3 180.0   5.0
  20   1   2   3   0.0   5.0
   2   1  20   3   0.0   5.0
   2   1  20  19 180.0   5.0
  14   1  20   3 180.0   5.0
  14   1  20  19   0.0   5.0
   1   2   3  20   0.0   5.0
   3   2   5   6 180.0   5.0
   2   3  20   1   0.0   5.0
   2   3  20  19 180.0   5.0
   9   7   8  10   0.0   5.0
  19   7   8  10 180.0   5.0
   8   7   9  11   0.0   5.0
  19   7   9  11 180.0   5.0
   7   8  10  12   0.0   5.0
   7   9  11  12   0.0   5.0
   8  10  12  11   0.0   5.0
   8  10  12  13 180.0   5.0
   9  11  12  10   0.0   5.0
   9  11  12  13 180.0   5.0
   1   2  14  20   0.0   5.0
   2   1   3   5 -35.0   5.0
   4   3  15  16   0.0   5.0
   7   8   9  19   0.0   5.0
  12  10  11  13   0.0   5.0
  19  17  18  20 -35.0   5.0
  19  20   7  17 -35.0   5.0
  20   1   3  19   0.0   5.0