Is the fence behind the bush?
Yes, the fence is behind the bush.
    src        edge_attr  dst
0     1      in front of   16
1     1   to the left of   20
2     1  to the right of   12
3     1   to the left of   10
4     3   to the left of   13
5     3   to the left of    4
6     4  to the right of   18
7     4   to the left of   15
8     4  to the right of    3
9     8           behind   20
10    9  to the right of   10
11   10   to the left of   17
12   10   to the left of   19
13   10  to the right of    1
14   10   to the left of    9
15   10  to the right of   12
16   10   to the left of   15
17   10               on   20
18   12   to the left of   20
19   12   to the left of    1
20   12   to the left of   10
21   13               on   12
22   13  to the right of   18
23   13  to the right of    3
24   15      in front of   16
25   15  to the right of   10
26   15  to the right of    4
27   16           behind   15
28   16           behind    1
29   17  to the right of   10
30   18               on   12
31   18   to the left of   13
32   18   to the left of    4
33   19  to the right of   10
34   19               on   20
35   20  to the right of    1
36   20  to the right of   12