Which kind of vegetable is on top of the pizza?
The vegetable is a tomato.
    src        edge_attr  dst
0     1        on top of    2
1     1   to the left of    7
2     1   to the left of    3
3     2             with    4
4     2               on    0
5     2             with    7
6     2             with    9
7     3        on top of    2
8     3  to the right of    1
9     4        on top of    2
10    5        on top of    2
11    7  to the right of    9
12    7               on    2
13    7  to the right of    1
14    9   to the left of    7
15    9               on    2
16   10        on top of    2