What does the snow cover?
The snow covers the mountains.
    src        edge_attr  dst
0     0  to the right of   18
1     0  to the right of   17
2     0  to the right of   20
3     0  to the right of    5
4     0  to the right of    3
..  ...              ...  ...
64   20          wearing   11
65   20          holding    0
66   21   to the left of    3
67   21   to the left of   10
68   23   to the left of    4

[69 rows x 3 columns]