Is there either any dirty grass or snow?
No, there is snow but it is clean.
    src        edge_attr  dst
0     2  to the right of    4
1     4   to the left of    6
2     4   to the left of    2
3     5   to the left of    6
4     5   to the left of   13
5     6               in    3
6     6  to the right of    4
7     6  to the right of    5
8     7  to the right of   14
9     7  to the right of    8
10    8   to the left of    7
11    8               on    0
12    9               on    3
13   13  to the right of    5
14   14   to the left of    7