Do the trees look white or green?
The trees are green.
    src        edge_attr  dst
0     0   to the left of    5
1     2   to the left of    7
2     2   to the left of   10
3     2   to the left of   12
4     5  to the right of   12
5     5  to the right of   13
6     5  to the right of    0
7     6  to the right of   13
8     7   to the left of    9
9     7  to the right of    2
10    8               on    3
11    8               on   11
12    9  to the right of    7
13    9  to the right of   10
14   10   to the left of    9
15   10  to the right of    2
16   10           behind   12
17   12   to the left of    5
18   12      in front of   10
19   12  to the right of    2
20   13   to the left of    5
21   13   to the left of    6