What color are the trees?
The trees are green.
     src        edge_attr  dst
0      0  to the right of   21
1      0  to the right of   12
2      0  to the right of    7
3      0               of   19
4      0  to the right of   14
..   ...              ...  ...
107   24  to the right of    6
108   24  to the right of    9
109   24  to the right of   20
110   24  to the right of    8
111   24  to the right of   15

[112 rows x 3 columns]