What is on the roof?
The bicycles are on the roof.
    src        edge_attr  dst
0     1   to the left of   18
1     1   to the left of   13
2     1   to the left of   17
3     1   to the left of   14
4     2  to the right of    6
..  ...              ...  ...
56   18   to the left of    8
57   18  to the right of   17
58   18   to the left of   16
59   18  to the right of   13
60   18  to the right of   14

[61 rows x 3 columns]