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