What is the bag on top of the bag in the bottom part called?
The bag is a backpack.
   src        edge_attr  dst
0    0   to the left of    7
1    1               by    3
2    1  to the right of    2
3    2               on    4
4    2   to the left of    1
5    4        on top of    5
6    7               on    3
7    7  to the right of    0