What is in front of the trees that the leaves are on?
The train is in front of the trees.
    src        edge_attr  dst
0     0            above    8
1     1               on   15
2     1   to the left of   14
3     1  to the right of    3
4     2   to the left of    8
5     3   to the left of   15
6     3   to the left of   14
7     3           behind    8
8     3             near    8
9     3   to the left of    1
10    4            above    8
11    6               in    5
12    7               in   12
13    7               at   12
14    7   to the left of    8
15    8            below    4
16    8  to the right of    9
17    8      in front of    3
18    8             near    3
19    8            above   13
20    8             near   11
21    8            below    0
22    8      in front of   15
23    8  to the right of    7
24    8  to the right of    2
25    9   to the left of    8
26    9               at   12
27   10   on the side of    8
28   10       painted on    8
29   11          next to    8
30   11  to the right of   13
31   13            under    8
32   13   to the left of   11
33   13               at   12
34   14  to the right of    3
35   14  to the right of    1
36   15  to the right of    3
37   15           behind    8