What are the trees in front of?
The trees are in front of the fence.
    src        edge_attr  dst
0     0           behind    9
1     0   to the left of    9
2     0   to the left of    5
3     1          wearing    4
4     1               on    2
5     1          wearing    7
6     1          wearing    8
7     3   to the left of    9
8     5  to the right of    0
9     9  to the right of    3
10    9  to the right of    0
11    9  to the right of   10
12    9      in front of    0
13   10               on    2
14   10   to the left of    9