Are there any sandwiches or pizzas that are not sitting?
No, there is a sandwich but it is sitting.
   src        edge_attr  dst
0    0          holding    4
1    1  to the right of    5
2    3   to the left of    4
3    4  to the right of    3
4    5   to the left of    1
5    5   to the left of    6
6    6  to the right of    5