What vegetables are on the hamburger?
The vegetables are tomatoes.
    src        edge_attr  dst
0     0  to the right of   10
1     0   to the left of   13
2     1  to the right of    4
3     1  to the right of   12
4     3               in    6
5     4   to the left of    1
6     4             with    7
7     4   to the left of    8
8     5  to the right of   13
9     5  to the right of    6
10    6   to the left of    5
11    6   to the left of   15
12    7               on    4
13    7   to the left of    8
14    8  to the right of    9
15    8  to the right of   12
16    8  to the right of    4
17    8  to the right of    7
18    9   to the left of    8
19    9        on top of   12
20    9               on   12
21   10   to the left of   14
22   10               on    6
23   10   to the left of    0
24   10   to the left of   11
25   10   to the left of   13
26   11  to the right of   10
27   11  to the right of   14
28   11   to the left of   13
29   12   to the left of    8
30   12   to the left of    1
31   13  to the right of   14
32   13  to the right of   11
33   13  to the right of    0
34   13   to the left of    5
35   13   to the left of   15
36   13  to the right of   10
37   14  to the right of   10
38   14   to the left of   13
39   14   to the left of   11
40   15  to the right of   13
41   15  to the right of    6