What's in the doorway?
The paper is in the doorway.
    src        edge_attr  dst
0     0  to the right of   20
1     0  to the right of   19
2     0  to the right of   10
3     0  to the right of   14
4     1  to the right of    9
..  ...              ...  ...
79   20   to the left of    0
80   20  to the right of   19
81   21          next to   15
82   21  to the right of    9
83   21  to the right of   17

[84 rows x 3 columns]