What is on the white plate?
The sandwich is on the plate.
    src        edge_attr  dst
0     0               on    5
1     0   to the left of   11
2     1   to the left of    3
3     1               on    5
4     2               on    5
5     2  to the right of    3
6     3   to the left of   11
7     3   to the left of    2
8     3               on    5
9     3  to the right of    1
10    4  to the right of    9
11    4   to the left of    6
12    4  to the right of   12
13    4               on    7
14    6               on    7
15    6  to the right of    4
16    6  to the right of   12
17    9   to the left of    4
18    9               on    7
19    9   to the left of   12
20    9  to the right of   10
21   10               on    7
22   10   to the left of   12
23   10   to the left of    9
24   11               on    5
25   11  to the right of    3
26   11  to the right of    0
27   12   to the left of    6
28   12   to the left of    4
29   12               on    7
30   12  to the right of    9
31   12  to the right of   10