Is the tree behind a train?
No, the tree is behind the bus.
    src        edge_attr  dst
0     2   to the left of   15
1     2  to the right of   14
2     2  to the right of    4
3     2  to the right of    3
4     2  to the right of   22
..  ...              ...  ...
58   22  to the right of    6
59   22   to the left of   15
60   22   to the left of   21
61   22  to the right of   14
62   23   to the left of    9

[63 rows x 3 columns]