What are the backpacks on?
The backpacks are on the seat.
    src        edge_attr  dst
0     0          wearing   17
1     0   to the left of   11
2     0   to the left of   18
3     0   to the left of   12
4     1  to the right of    2
..  ...              ...  ...
62   19  to the right of   11
63   19  to the right of    6
64   19  to the right of    4
65   20  to the right of    9
66   20  to the right of   11

[67 rows x 3 columns]