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