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