Is the shoe lace blue or is it black?
The shoe lace is black.
   src        edge_attr  dst
0    0  to the right of    5
1    0  to the right of    8
2    2         lying on    7
3    5   to the left of    6
4    5   to the left of    0
5    6  to the right of    5
6    8   to the left of    0