What color do the trees behind the fence have?
The trees have green color.
    src        edge_attr  dst
0     0             near   14
1     0  to the right of    5
2     0  to the right of    4
3     0  to the right of   10
4     0       mounted on    8
5     0  to the right of   13
6     1   to the left of    4
7     2  on the front of    1
8     2   to the left of    3
9     2   to the left of    4
10    3   to the left of    4
11    3  to the right of    2
12    3   on the side of    1
13    4  to the right of    1
14    4  to the right of    3
15    4   to the left of    0
16    4   to the left of   13
17    4  to the right of    2
18    5               on    4
19    5   to the left of    0
20    5   to the left of   13
21    8   to the left of   16
22   10   to the left of    0
23   10           behind   15
24   13  to the right of    5
25   13   to the left of    0
26   13  to the right of    4
27   14             near    0
28   15      in front of   10
29   16  to the right of    8