What is on the bookshelf?
The lamp is on the bookshelf.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of   11
2     0  to the right of   14
3     0  to the right of   13
4     0  to the right of    3
..  ...              ...  ...
67   17               on   16
68   17   to the left of    4
69   18   to the left of    2
70   18   to the left of    6
71   18   to the left of    7

[72 rows x 3 columns]