Which place is it?
It is a train station.
    src        edge_attr  dst
0     0       sitting on    5
1     0      waiting for    3
2     0  to the right of   13
3     0  to the right of    4
4     0  to the right of    3
..  ...              ...  ...
94   19   to the left of   13
95   19   to the left of   14
96   19  to the right of    1
97   19   to the left of   16
98   19   to the left of   15

[99 rows x 3 columns]