What is in the tray in the bottom part of the picture?
The bun is in the tray.
    src        edge_attr  dst
0     1               on    3
1     2               on    3
2     3               on    0
3     3               on    4
4     3             with    3
5     3               in    5
6     3               on    3
7     3            above    4
8     3             near    7
9     3               on    5
10    4            under    3
11    4  to the right of    7
12    4               on    5
13    6               on    3
14    7   to the left of    4
15    7             near    3
16    8               on    7