What vehicle is carrying the bicycles?
The vehicle is a car.
   src       edge_attr  dst
0    1          behind    5
1    1     in front of    4
2    3  on the side of    4
3    4          behind    1
4    5        carrying    8
5    5     in front of    1
6    6    growing from    2
7    8  on the back of    5
8    9  on the back of    5