What vehicle is the tree behind of?
The tree is behind the train.
     src        edge_attr  dst
0      0   to the left of    6
1      0   to the left of   10
2      0   to the left of   25
3      0   to the left of    5
4      0   to the left of   30
..   ...              ...  ...
194   31  to the right of   30
195   31  to the right of    7
196   31  to the right of    6
197   31   to the left of   10
198   31   to the left of   25

[199 rows x 3 columns]