What is in the basket?
The sandwich is in the basket.
   src        edge_attr  dst
0    0        on top of    4
1    0   to the left of    7
2    1  to the right of    2
3    2   to the left of    1
4    4               in    3
5    4   to the left of    6
6    4             with    0
7    6  to the right of    4
8    7        on top of    4
9    7  to the right of    0