Is the fence in the bottom or in the top part of the image?
The fence is in the bottom of the image.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of   16
2     0   to the left of   18
3     0   to the left of   11
4     0   to the left of   15
5     2  to the right of   13
6     2   to the left of   14
7     2  to the right of    4
8     2  to the right of    3
9     3   to the left of    2
10    4   to the left of   14
11    4   to the left of    2
12    5   to the left of   11
13    5   to the left of   16
14    6   to the left of   16
15    6   to the left of   18
16    6  to the right of    0
17    6   to the left of   11
18    8               on    7
19    8  to the right of   11
20    8  to the right of   16
21    9   to the left of   11
22    9   to the left of   16
23    9             near   15
24   10   to the left of   14
25   11  to the right of    9
26   11  to the right of    0
27   11  to the right of   15
28   11  to the right of    5
29   11   to the left of    8
30   11  to the right of    6
31   11  to the right of   18
32   13   to the left of    2
33   14  to the right of    4
34   14  to the right of   10
35   14  to the right of    2
36   15  to the right of    0
37   15   to the left of   18
38   15   to the left of   11
39   15             near    9
40   15   to the left of   16
41   16  to the right of    9
42   16  to the right of    5
43   16   to the left of    8
44   16  to the right of    6
45   16  to the right of    0
46   16  to the right of   15
47   18   to the left of   20
48   18  to the right of    6
49   18   to the left of   11
50   18  to the right of   15
51   18  to the right of    0
52   19               in   12
53   20               in   12
54   20  to the right of   18