What kind of food is to the left of the tomatoes?
The food is a sandwich.
    src        edge_attr  dst
0     0   to the left of   10
1     0  to the right of    3
2     1               on    6
3     1               of   17
4     1   to the left of   10
..  ...              ...  ...
75   17               in    1
76   17   to the left of   10
77   17  to the right of    2
78   17   to the left of    9
79   17   to the left of    8

[80 rows x 3 columns]