What's covered with the snow?
The tree is covered with snow.
     src        edge_attr  dst
0      0  to the right of   12
1      0  to the right of   20
2      1  to the right of   21
3      1   to the left of   13
4      1  to the right of   22
..   ...              ...  ...
109   22  to the right of   17
110   22  to the right of   20
111   23   to the left of   20
112   23   to the left of   15
113   23   to the left of    5

[114 rows x 3 columns]