What is the food on the pizza made of wood?
The food is mushrooms.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of   12
2     1   to the left of   11
3     2   to the left of    8
4     2  to the right of   12
5     3  to the right of   12
6     3   to the left of    8
7     4  to the right of    0
8     6               on    9
9     7   to the left of   14
10    8  to the right of    2
11    8  to the right of   12
12    8  to the right of    3
13    9             with   11
14    9             with    6
15   11               on    9
16   11  to the right of    1
17   12  to the right of    0
18   12   to the left of    2
19   12   to the left of    3
20   12   to the left of    8
21   14  to the right of    7