Do you see fences there?
Yes, there is a fence.
    src        edge_attr  dst
0     0  to the right of    7
1     1   to the left of   15
2     1   to the left of    4
3     1   to the left of   11
4     2  to the right of    7
5     4  to the right of    1
6     5  to the right of    7
7     6          wearing    0
8     6        riding on    3
9     6  to the right of    7
10    7   to the left of    2
11    7   to the left of    6
12    7   to the left of    5
13    7   to the left of    9
14    7   to the left of    0
15    7  to the right of   11
16    8          wearing   16
17    8   to the left of   11
18    8        on top of   14
19    8        riding on   14
20    8   to the left of   15
21    9  to the right of    7
22   11   to the left of    7
23   11  to the right of   16
24   11  to the right of    8
25   11  to the right of    1
26   15  to the right of    1
27   15  to the right of    8
28   15  to the right of   16
29   16   to the left of   11
30   16   to the left of   15