Connection table for 4BF
  13  13  15
 C
 C
 C
BR
 C
 C
 C
 C
 C
 N
 C
 O
 O
   1   2
   1   7
   2   3
   3   4
   3   5
   5   6
   6   7
   7   8
   8   9
   9  10
   9  11
  11  12
  11  13
   7   1   2   3   0.0   5.0
   2   1   7   6   0.0   5.0
   2   1   7   8 180.0   5.0
   1   2   3   4 180.0   5.0
   1   2   3   5   0.0   5.0
   2   3   5   6   0.0   5.0
   4   3   5   6 180.0   5.0
   3   5   6   7   0.0   5.0
   5   6   7   1   0.0   5.0
   5   6   7   8 180.0   5.0
   7   8   9  11 180.0   5.0
   3   2   4   5   0.0   5.0
   7   1   6   8   0.0   5.0
   9   8  10  11  35.0   5.0
  11   9  12  13   0.0   5.0