What is on the tray?
The pizzas are on the tray.
    src        edge_attr  dst
0     0               on   16
1     0  to the right of   11
2     0  to the right of   13
3     1   to the left of   15
4     1   to the left of    6
5     1  to the right of    2
6     2   to the left of    1
7     2   to the left of   14
8     2   to the left of   12
9     3   to the left of    7
10    3               on    8
11    4  to the right of   11
12    4  to the right of   15
13    4  to the right of    6
14    4  to the right of    7
15    4               on    8
16    5  to the right of   12
17    6             with   15
18    6   to the left of    4
19    6  to the right of   11
20    6  to the right of    1
21    7  to the right of    3
22    7   to the left of    4
23    9   to the left of   13
24    9   to the left of   12
25    9   to the left of   14
26   10  to the right of   12
27   11   to the left of    6
28   11          wearing    1
29   11           behind   14
30   11   to the left of   12
31   11           making   13
32   11   to the left of    4
33   11   to the left of   15
34   11   to the left of   16
35   11   to the left of    0
36   11               by   13
37   12  to the right of   11
38   12  to the right of    2
39   12   to the left of   10
40   12  to the right of    9
41   12   to the left of    5
42   12               on   14
43   13   to the left of   16
44   13               on   12
45   13  to the right of    9
46   13   to the left of    0
47   14  to the right of    9
48   14  to the right of    2
49   14      in front of   11
50   15  to the right of    1
51   15  to the right of   11
52   15   to the left of    4
53   16  to the right of   11
54   16             with    0
55   16  to the right of   13