What are the dishes on?
The dishes are on the shelf.
    src        edge_attr  dst
0     0   to the left of    4
1     0  to the right of   20
2     0               on   19
3     0  to the right of    9
4     1   to the left of    3
..  ...              ...  ...
76   22   to the left of    6
77   22  to the right of   21
78   22               on   19
79   22  to the right of   20
80   22               on   10

[81 rows x 3 columns]