dl n=9, format=edgelist1
labels:
     A,B,C,D,E,F,G,H,I
 data:
   1  1  1
   1  2  1
   1  6  1
   1  8  1
   2  1  1
   2  2  1
   2  3  1
   2  6  1
   2  7  1
   2  8  1
   3  2  1
   3  3  1
   3  8  1
   4  4  1
   5  1  1
   5  2  1
   5  5  1
   5  6  1
   5  8  1
   6  1  1
   6  2  1
   6  7  -1
   6  8  -1
   7  2  1
   7  7  1
   7  8  1
   8  1  1
   8  2  1
   8  5  1
   8  6  1
   8  7  1
   9  9  1