Where is the snow?
The snow is on the mountain.
    src        edge_attr  dst
0     0   to the left of    7
1     0   to the left of    8
2     1  to the right of   11
3     2   to the left of    3
4     3  to the right of   11
5     3  to the right of    2
6     4   to the left of    7
7     7  to the right of    4
8     7  to the right of    0
9     7  to the right of    8
10    8  to the right of    0
11    8  to the right of   13
12    8   to the left of    7
13    9               of    1
14   11   to the left of    3
15   11   to the left of    1
16   12               on   10
17   13   to the left of    8