Are there either any cats or elephants?
Yes, there is a cat.
   src        edge_attr  dst
0    0   to the left of    2
1    2  to the right of    0
2    2  to the right of    8
3    2  to the right of    4
4    3   to the left of    6
5    4   to the left of    2
6    6  to the right of    3
7    7  to the right of    8
8    8   to the left of    7
9    8   to the left of    2