Are there fences or elephants?
Yes, there are elephants.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of    1
2     0   to the left of    5
3     1  to the right of    8
4     1  to the right of    0
5     1  to the right of   16
6     3  to the right of   16
7     3  to the right of    8
8     4   to the left of   13
9     4  to the right of   16
10    4  to the right of    0
11    4  to the right of    8
12    5  to the right of    9
13    5  to the right of   16
14    5  to the right of    8
15    5  to the right of    0
16    6   to the left of   13
17    8   to the left of    5
18    8   to the left of    3
19    8   to the left of    1
20    8   to the left of    4
21    9   to the left of   13
22    9   to the left of    5
23   11   to the left of   13
24   13  to the right of    9
25   13  to the right of    6
26   13  to the right of   15
27   13  to the right of   11
28   13  to the right of    4
29   14               of   15
30   15   to the left of   13
31   16   to the left of    1
32   16   to the left of    3
33   16   to the left of    4
34   16   to the left of    5