What kind of vegetable is on top of the food the person is sitting in front of?
The vegetables are olives.
    src            edge_attr  dst
0     0       to the left of    7
1     0              serving   15
2     1       to the left of   16
3     2      to the right of   14
4     3      to the right of    4
5     3      to the right of   16
6     3            on top of   15
7     4       to the left of    3
8     5      to the right of    9
9     5                   on   15
10    6                   on   15
11    6      to the right of    9
12    7      to the right of    0
13    7      to the right of   12
14    9       to the left of    5
15    9       to the left of   13
16    9       to the left of   11
17    9       to the left of    6
18   11      to the right of    9
19   12  sitting in front of   15
20   12       to the left of    7
21   13      to the right of    9
22   14       to the left of    2
23   15                 with    6
24   15                 with    3
25   15                 with    5
26   16      to the right of    1
27   16       to the left of    3