Is the tall bookshelf to the left or to the right of the books?
The bookshelf is to the left of the books.
    src        edge_attr  dst
0     0   to the left of    7
1     0   to the left of    8
2     0   to the left of   14
3     0   to the left of    6
4     0  to the right of   20
..  ...              ...  ...
68   21   to the left of    0
69   21   to the left of   14
70   21  to the right of    3
71   21   to the left of    6
72   21  to the right of    1

[73 rows x 3 columns]