What is under the pizza?
The napkin is under the pizza.
    src        edge_attr  dst
0     0      in front of    7
1     1               on    5
2     1   to the left of   12
3     1  to the right of   11
4     1  to the right of   13
5     2               on    4
6     4               on    5
7     4             with   10
8     4               on    0
9     4            above    5
10    4             with   14
11    5            under    4
12    5               on    4
13    6               on   14
14    7           behind    0
15    7  to the right of    9
16    7  to the right of   13
17    8               in    1
18    9   to the left of    7
19   10               on    4
20   11               on   13
21   11   to the left of    1
22   12  to the right of    1
23   13   to the left of    7
24   13   to the left of    1
25   14               on    4