Are there fences or cows?
No, there are no fences or cows.
   src        edge_attr  dst
0    0   to the left of    1
1    1  to the right of    0
2    1  to the right of    6
3    2   to the left of    3
4    3  to the right of    2
5    5  to the right of    6
6    6   to the left of    5
7    6   to the left of    1