What is on the shelf the doughnuts are to the left of?
The trays are on the shelf.
     src        edge_attr  dst
0      0   to the left of   17
1      2  to the right of   12
2      3  to the right of   41
3      3  to the right of   40
4      3  to the right of   36
..   ...              ...  ...
184   41   to the left of   13
185   41   to the left of   15
186   41  to the right of   16
187   41   to the left of   18
188   41   to the left of   25

[189 rows x 3 columns]