Do you see zebras or cows that are not standing?
No, there is a zebra but it is standing.
   src        edge_attr  dst
0    2  to the right of    5
1    3  to the right of    4
2    4   to the left of    7
3    4   to the left of    3
4    5   to the left of    2
5    6   to the left of    7
6    7  to the right of    6
7    7  to the right of    4