Which kind of food is in the bread?
The food is a sausage.
   src        edge_attr  dst
0    1           behind    6
1    1  to the right of    4
2    2               in    4
3    3               in    4
4    4               in    6
5    4               on    6
6    4   to the left of    1
7    5               in    4
8    6        on top of    0
9    6      in front of    1