Which place is it?
It is a forest.
    src        edge_attr  dst
0     0   to the left of   22
1     0   to the left of   13
2     0   to the left of    2
3     0   to the left of   21
4     0   to the left of   18
..  ...              ...  ...
60   22   to the left of   20
61   22  to the right of   18
62   22  to the right of   13
63   22  to the right of    5
64   22  to the right of    0

[65 rows x 3 columns]