What color is that olive?
The olive is green.
   src        edge_attr  dst
0    0               on    1
1    0  to the right of    7
2    1  to the right of    7
3    2               by    1
4    3               in    2
5    4               on    6
6    7   to the left of    1
7    7   to the left of    0
8    7               by    1