Do you see either any fences or benches there?
Yes, there is a fence.
    src        edge_attr  dst
0     0   to the left of   13
1     0  to the right of   16
2     1  to the right of   11
3     2  to the right of    9
4     3  to the right of    6
5     3  to the right of    9
6     4  to the right of    5
7     4  to the right of    9
8     5   to the left of    4
9     5  to the right of    9
10    6  to the right of    9
11    6   to the left of    3
12    9   to the left of    5
13    9   to the left of    6
14    9   to the left of   14
15    9   to the left of    2
16    9   to the left of    3
17    9   to the left of    4
18   11  to the right of   15
19   11   to the left of    1
20   11       sitting on   10
21   13  to the right of    0
22   13  to the right of   16
23   14  to the right of    9
24   15   to the left of   11
25   16   to the left of   13
26   16   to the left of    0