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