What is the grass near the road covered by?
The grass is covered by the snow.
    src        edge_attr  dst
0     0             near    4
1     0             near    8
2     0  to the right of    6
3     0  to the right of    3
4     1               on    5
5     2       covered by    3
6     2             near    4
7     2             near    7
8     2  to the right of    3
9     2  to the right of    7
10    2  to the right of    4
11    3         covering    2
12    3   to the left of    0
13    3   to the left of    2
14    3         covering    5
15    3               on    2
16    3               on    0
17    3               on    5
18    4   to the left of    8
19    4             near    5
20    4             near    2
21    4   to the left of    2
22    4             near    0
23    5          next to    4
24    5             near    4
25    5       covered by    3
26    5       covered in    3
27    6   to the left of    0
28    7   to the left of    2
29    7             near    2
30    8             near    0
31    8  to the right of    4
32    8               on    7