What is the tree covered with?
The tree is covered with snow.
     src        edge_attr  dst
0      0  to the right of   13
1      0  to the right of    3
2      0  to the right of    4
3      1   to the left of   15
4      3   to the left of   20
..   ...              ...  ...
120   35   to the left of   16
121   36  to the right of   31
122   36  to the right of   28
123   36  to the right of   22
124   36  to the right of   23

[125 rows x 3 columns]