What is the name of the vegetable to the right of the spinach?
The vegetable is a tomato.
    src        edge_attr  dst
0     1  to the right of    3
1     1  to the right of    2
2     1  to the right of    6
3     2               on    3
4     2   to the left of    1
5     3   to the left of    1
6     3             with    5
7     3  to the right of    4
8     4   to the left of    3
9     5               on    3
10    6   to the left of    1