Is this a zebra or a cow?
This is a zebra.
   src        edge_attr  dst
0    2             near    4
1    2  to the right of    4
2    2  to the right of    3
3    3  to the right of    5
4    3   to the left of    2
5    4   to the left of    2
6    4             near    2
7    5   to the left of    3