What is on the building?
The clock is on the building.
    src        edge_attr  dst
0     0       walking in    1
1     0   to the left of   18
2     0   to the left of   15
3     0   to the left of   11
4     0  to the right of    5
..  ...              ...  ...
69   20               on    9
70   21  to the right of   16
71   21  to the right of   18
72   21  to the right of    2
73   21  to the right of   11

[74 rows x 3 columns]