Is the sandwich on the tray?
Yes, the sandwich is on the tray.
    src        edge_attr  dst
0     0   to the left of   16
1     0   to the left of    6
2     0   to the left of   10
3     1   to the left of    7
4     1               on    0
..  ...              ...  ...
62   18   to the left of    6
63   18   to the left of    7
64   18   to the left of   16
65   18  to the right of    4
66   18   to the left of   10

[67 rows x 3 columns]