Is the tree growing behind a pig?
No, the tree is growing behind the horse.
    src        edge_attr  dst
0     0   to the left of   16
1     0   to the left of   13
2     0   to the left of    2
3     1   to the left of    2
4     2  to the right of   18
..  ...              ...  ...
63   18   to the left of   16
64   18   to the left of   13
65   18  to the right of    7
66   18  to the right of   11
67   18   to the left of   15

[68 rows x 3 columns]