Are the tall trees green or dark?
The trees are dark.
   src        edge_attr  dst
0    0               in    7
1    1               of    3
2    1   to the left of    6
3    3      flying over    4
4    3            above    5
5    3            above    4
6    5               of    3
7    6               of    3
8    6  to the right of    1