Is the lettuce on a sandwich?
No, the lettuce is on a plate.
    src        edge_attr  dst
0     0   to the left of    3
1     0  to the right of    4
2     0               on    7
3     0  to the right of   11
4     0  to the right of    8
..  ...              ...  ...
67   17               in   18
68   17  to the right of    8
69   18               of   17
70   18  to the right of    8
71   18               on    8

[72 rows x 3 columns]