What is covered by the snow?
The ground is covered by the snow.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    4
2     1  to the right of   11
3     1   to the left of    4
4     3  to the right of    0
5     4  to the right of    1
6     4  to the right of   12
7     4  to the right of    5
8     4  to the right of    0
9     4  to the right of   11
10    5          wearing    8
11    5   to the left of    4
12    7         covering   16
13   11   to the left of    1
14   11   to the left of   12
15   11   to the left of    4
16   12  to the right of   11
17   12   to the left of    4
18   16       covered by    7