What is on the pizza?
The sauce is on the pizza.
    src        edge_attr  dst
0     0   to the left of    5
1     0  to the right of    2
2     1   to the left of    2
3     2   to the left of    0
4     2  to the right of    1
5     5  to the right of    0
6     7               on    8
7     8             with    7
8     8     covered with    3
9     8     covered with    4
10    9               in   10