Are there blue buses or doors?
Yes, there are blue doors.
    src        edge_attr  dst
0     1   to the left of   19
1     1  to the right of    8
2     1  to the right of   25
3     2  to the right of   19
4     2  to the right of   12
..  ...              ...  ...
71   24  to the right of   23
72   24  to the right of    7
73   24  to the right of   11
74   25   to the left of    1
75   25  to the right of   18

[76 rows x 3 columns]