Which place is it?
It is a lobby.
    src        edge_attr  dst
0     1  to the right of    8
1     1  to the right of    5
2     2  to the right of   19
3     2  to the right of   10
4     3  to the right of   19
..  ...              ...  ...
69   19   to the left of    3
70   19   to the left of    7
71   19   to the left of    2
72   19   to the left of   12
73   19  to the right of   11

[74 rows x 3 columns]