Which color are the tall trees?
The trees are blue.
    src        edge_attr  dst
0     0               in    5
1     1   to the left of   12
2     1   to the left of   11
3     1               in    5
4     2  to the right of    4
5     2  to the right of   15
6     2  to the right of    9
7     2            below    6
8     3             near    5
9     4   to the left of    2
10    4             near    5
11    4               in    5
12    5             near    3
13    5             near    4
14    5            above    3
15    6            above    2
16    7               in    5
17    8               in    5
18    9  to the right of   12
19    9  to the right of   11
20    9   to the left of    2
21   10  to the right of   11
22   10  to the right of   12
23   11   to the left of    9
24   11   to the left of   10
25   11  to the right of    1
26   12  to the right of    1
27   12   to the left of    9
28   12   to the left of   10
29   14               in    5
30   15   to the left of    2