What is the snow on?
The snow is on the railroad tracks.
    src        edge_attr  dst
0     0   to the left of    8
1     0   to the left of    4
2     0   to the left of    2
3     0   to the left of    7
4     0   to the left of    5
5     1   to the left of    5
6     2  to the right of    0
7     2   to the left of    7
8     3               by    7
9     3  to the right of    7
10    3  to the right of    5
11    3  to the right of    6
12    4   to the left of    7
13    4  to the right of    0
14    4  to the right of    8
15    5   to the left of    9
16    5   to the left of    3
17    5  to the right of    1
18    5  to the right of    0
19    6   to the left of    3
20    7  to the right of    0
21    7  to the right of    2
22    7   to the left of    3
23    7  to the right of    4
24    7   to the left of    9
25    8               on    4
26    8  to the right of    0
27    8   to the left of    4
28    9  to the right of    7
29    9  to the right of    5