Are there fences in front of the trees the leaves are on?
No, the fence is behind the trees.
    src        edge_attr  dst
0     0  to the right of   16
1     0  to the right of    9
2     1               of    2
3     2               in    3
4     2   to the left of    5
5     5  to the right of    2
6     5  to the right of    6
7     5  to the right of   15
8     5  to the right of   13
9     5  to the right of   12
10    5  to the right of   18
11    6      in front of   16
12    6   to the left of   18
13    6   to the left of   12
14    6   to the left of   15
15    6   to the left of    9
16    6   to the left of    7
17    6   to the left of    5
18    7               on    3
19    7               on    6
20    7   to the left of    9
21    7  to the right of    6
22    8               of    5
23    8  to the right of    9
24    9   to the left of   14
25    9   to the left of   17
26    9   to the left of    8
27    9  to the right of   12
28    9  to the right of    6
29    9  to the right of    7
30    9  to the right of   18
31    9   to the left of    0
32   10   to the left of   14
33   10   to the left of   17
34   11               of    5
35   12   to the left of    9
36   12  to the right of    6
37   12   to the left of    5
38   13               of    2
39   13   to the left of    5
40   14               of    5
41   14   to the left of   17
42   14  to the right of   10
43   14  to the right of    9
44   15  to the right of    6
45   15   to the left of    5
46   16   to the left of    0
47   16           behind    6
48   17               of    5
49   17  to the right of    9
50   17  to the right of   14
51   17  to the right of   10
52   18               of    2
53   18  to the right of    6
54   18   to the left of    5
55   18   to the left of    9