The ground is covered in what?
The ground is covered in snow.
   src        edge_attr  dst
0    0               on    7
1    0  to the right of    3
2    1               on    7
3    3   to the left of    0
4    4       covered in    8
5    6               on    7
6    7       covered in    0
7    8               on    4
8    8   to the left of   10
9   10  to the right of    8