Which side is the book on, the right or the left?
The book is on the left of the image.
    src        edge_attr  dst
0     0   to the left of    1
1     0   to the left of    5
2     0   to the left of    9
3     0  to the right of   17
4     0  to the right of   11
..  ...              ...  ...
73   20   to the left of   18
74   20       sitting on   11
75   20  to the right of   16
76   20   to the left of    3
77   20               on   11

[78 rows x 3 columns]