Is this place a zoo or a farm?
It is a zoo.
    src        edge_attr  dst
0     1   to the left of   11
1     1   to the left of    4
2     1   to the left of    9
3     1   to the left of    5
4     3  to the right of   13
5     4  to the right of   13
6     4  to the right of   11
7     4  to the right of    1
8     5  to the right of    1
9     5  to the right of   11
10    5  to the right of    9
11    5  to the right of   13
12    8   to the left of   13
13    9  to the right of    1
14    9   to the left of    5
15    9  to the right of   11
16   11   to the left of    5
17   11   to the left of    9
18   11  to the right of    1
19   11   to the left of    4
20   12   to the left of   13
21   13   to the left of    5
22   13   to the left of    4
23   13   to the left of    3
24   13  to the right of   12
25   13  to the right of    8