What's sitting on top of the shelf?
The book is sitting on top of the shelf.
    src        edge_attr  dst
0     0  to the right of   15
1     0   to the left of   18
2     0   to the left of   19
3     0  to the right of   17
4     0  to the right of   20
..  ...              ...  ...
83   18  to the right of   14
84   19  to the right of    3
85   19   to the left of   11
86   19  to the right of    0
87   20   to the left of    0

[88 rows x 3 columns]