What is on the bun?
The hamburger is on the bun.
    src        edge_attr  dst
0     1   to the left of    6
1     2             with    5
2     2   to the left of    6
3     4   to the left of    8
4     4  to the right of    5
5     5               on    2
6     5   to the left of    4
7     5               on    8
8     5   to the left of    8
9     5   to the left of    6
10    6  to the right of    1
11    6  to the right of    7
12    6  to the right of    5
13    6  to the right of    2
14    7   to the left of    8
15    7   to the left of    6
16    8  to the right of    5
17    8  to the right of    7
18    8  to the right of    4