Where are the trees?
The trees are on the hill.
    src        edge_attr  dst
0     1  to the right of   12
1     3    coming out of   18
2     3  to the right of    8
3     3  to the right of    5
4     3  to the right of    7
5     4   to the left of   13
6     4  to the right of   14
7     4   to the left of    7
8     4   to the left of    9
9     5   to the left of    3
10    5               in    2
11    6               on    7
12    6           behind   18
13    7  to the right of    4
14    7   to the left of    3
15    7  to the right of    8
16    7   to the left of   18
17    7  to the right of   13
18    7   to the left of   11
19    8   to the left of    9
20    8   to the left of    3
21    8   to the left of    7
22    8   to the left of   18
23    9  to the right of    4
24    9  to the right of   13
25    9  to the right of    8
26    9   to the left of   18
27   11  on the front of   18
28   11  to the right of    7
29   12   to the left of    1
30   13  to the right of    4
31   13   to the left of    9
32   13   to the left of    7
33   14               on    4
34   14   to the left of    4
35   15               of   16
36   18  to the right of    7
37   18  to the right of    8
38   18      in front of    6
39   18  to the right of    9