What is covered with leaves?
The ground is covered with leaves.
    src       edge_attr  dst
0     0  to the left of   17
1     0  to the left of   16
2     0  to the left of   18
3     0  to the left of    2
4     0  to the left of   12
..  ...             ...  ...
89   20  to the left of   18
90   20  to the left of   15
91   21  to the left of   11
92   21  to the left of    4
93   21  to the left of    7

[94 rows x 3 columns]