What's in the sandwich?
The spinach is in the sandwich.
    src        edge_attr  dst
0     1   to the left of    5
1     1  to the right of    4
2     2               in   11
3     2  to the right of    8
4     3       resting on    7
5     3   to the left of   13
6     4               on   10
7     4  to the right of   11
8     4   to the left of    5
9     4   to the left of    1
10    4  to the right of   12
11    5  to the right of    7
12    5  to the right of    1
13    5  to the right of    4
14    6             with   13
15    7   to the left of    5
16    8   to the left of   13
17    8   to the left of    2
18    9               on   13
19   11               on    7
20   11   to the left of    4
21   11               on   10
22   12   to the left of    4
23   13  to the right of    3
24   13  to the right of    8
25   13               on    6