What's on the shelf?
The tissue papers are on the shelf.
    src        edge_attr  dst
0     0   to the left of   14
1     0   to the left of   13
2     0  to the right of    8
3     0   to the left of   16
4     0   to the left of   12
..  ...              ...  ...
87   16   to the left of    4
88   16  to the right of    8
89   16   to the left of   12
90   16   to the left of   11
91   16  to the right of    0

[92 rows x 3 columns]