Of what color are the large trees?
The trees are green.
    src        edge_attr  dst
0     0  to the right of    3
1     1   to the left of    5
2     3         covering    6
3     3   to the left of    0
4     3   to the left of    7
5     3   to the left of    4
6     3   to the left of    9
7     3   to the left of    8
8     3               on    6
9     4  to the right of    3
10    5  to the right of    1
11    6       covered by    3
12    7  to the right of    3
13    7  to the right of    8
14    8  to the right of    3
15    8   to the left of    7
16    9  to the right of    3