What is covered by the snow that is shown in the photo?
The roof is covered by the snow.
    src        edge_attr  dst
0     0   to the left of   18
1     2   to the left of   14
2     2   to the left of   15
3     2  to the right of    3
4     2   to the left of   17
..  ...              ...  ...
70   20  to the right of   21
71   21  to the right of    3
72   21   to the left of   19
73   21   to the left of   20
74   21       covered by    5

[75 rows x 3 columns]