What is on the paper?
The number is on the paper.
    src        edge_attr  dst
0     0           behind   15
1     1  to the right of   20
2     1  to the right of   15
3     1       sitting on   12
4     1   to the left of   11
..  ...              ...  ...
61   21   to the left of   13
62   21   to the left of    9
63   21   to the left of   14
64   22               on   20
65   22  to the right of   21

[66 rows x 3 columns]