Which kind of vegetable is on the pizza?
The vegetable is an onion.
    src        edge_attr  dst
0     0  to the right of    3
1     0   to the left of    2
2     2               on    8
3     2  to the right of    0
4     2  to the right of    3
5     3   to the left of    2
6     3   to the left of    0
7     5  to the right of   10
8     5   to the left of   12
9     5  to the right of   11
10    5               on    8
11    7  to the right of    9
12    8             with    9
13    8             with    5
14    8             with   10
15    8             with   11
16    8               on    1
17    8             with   12
18    9               on    8
19    9   to the left of    7
20   10               on    8
21   10   to the left of   12
22   10  to the right of   11
23   10   to the left of    5
24   11   to the left of    5
25   11   to the left of   10
26   11   to the left of   12
27   11               on    8
28   12  to the right of    5
29   12  to the right of   11
30   12               on    8
31   12  to the right of   10