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