What is covered with snow?
The ground is covered with snow.
    src        edge_attr  dst
0     0   to the left of   20
1     0  to the right of   18
2     0   to the left of    3
3     0   to the left of    1
4     0  to the right of    9
..  ...              ...  ...
78   22  to the right of    3
79   22   to the left of    6
80   22  to the right of    1
81   23  to the right of    6
82   23   to the left of    7

[83 rows x 3 columns]