What is the man on?
The man is on the motorbike.
   src        edge_attr  dst
0    2  to the right of    8
1    3  to the right of    8
2    4               on    5
3    4  to the right of    8
4    5               in    1
5    8   to the left of    2
6    8   to the left of    3
7    8   to the left of    4