What is the cheese on?
The cheese is on the crust.
    src        edge_attr  dst
0     2               on    9
1     3   to the left of    9
2     4   to the left of    9
3     5  to the right of   14
4     6   to the left of   12
5     9  to the right of    4
6     9  to the right of    3
7    11               on   13
8    11  to the right of   12
9    12   to the left of   11
10   12  to the right of    6
11   13  to the right of   14
12   14               on   15
13   14   to the left of    5
14   14   to the left of   13
15   16  to the right of   17
16   17   to the left of   16