What is covered with snow?
The ground is covered with snow.
    src     edge_attr  dst
0     0    covered in    7
1     0  covered with    7
2     0    covered by    7
3     3   skiing down    5
4     3            on    5
5     3            in    7
6     3     on top of    7
7     3        inside    7
8     3    going down    5
9     4       wearing    8
10    5    covered by    7
11    6    covered by    7
12    7      covering    5
13    7      covering    0
14    7            on    0
15   10    covered in    7