What vegetable is on the table?
The vegetable is lettuce.
    src        edge_attr  dst
0     1               on    0
1     1               on    2
2     1   to the left of    3
3     3               on    2
4     3  to the right of    1
5     3               on    0
6     3   to the left of    6
7     4               on    0
8     5               on    0
9     5               on    2
10    6               on    0
11    6  to the right of    3