Which place is it?
It is a train station.
    src        edge_attr  dst
0     0   to the left of   22
1     0   to the left of   21
2     0   to the left of    5
3     0  to the right of    1
4     0   to the left of   20
..  ...              ...  ...
62   22  to the right of   20
63   22  to the right of    1
64   22  to the right of    0
65   22  to the right of   16
66   22  to the right of    5

[67 rows x 3 columns]