What is covered in snow?
The ground is covered in snow.
    src        edge_attr  dst
0     0          wearing    4
1     0        riding on    3
2     0          wearing    8
3     0          wearing    2
4     0               on    3
5     2  to the right of   11
6     4  to the right of   11
7     5               in   12
8     6   to the left of   14
9     6       covered by   12
10    7               of    0
11    8  to the right of   11
12    9  to the right of   10
13   10   to the left of   11
14   10   to the left of    9
15   11   to the left of    8
16   11  to the right of   10
17   11   to the left of    4
18   11   to the left of    2
19   12               on   13
20   12         covering   13
21   13       covered in   12
22   13       covered by   12
23   14  to the right of    6