Is this a zoo or a garden?
It is a garden.
    src        edge_attr  dst
0     0   to the left of   13
1     0   to the left of   17
2     0   to the left of   12
3     0   to the left of    5
4     0   to the left of    9
..  ...              ...  ...
76   19   to the left of   10
77   19  to the right of    9
78   19  to the right of    3
79   19  to the right of    5
80   19  to the right of   11

[81 rows x 3 columns]