What is in front of the trees?
The window is in front of the trees.
    src        edge_attr  dst
0     0   to the left of   14
1     0   to the left of   13
2     0               in    6
3     0  to the right of    5
4     0   to the left of   18
..  ...              ...  ...
75   17   to the left of    8
76   17  to the right of    6
77   18  to the right of    0
78   18  to the right of    5
79   18  to the right of    6

[80 rows x 3 columns]