Who is riding on the surfboard?
The girl is riding on the surfboard.
   src        edge_attr  dst
0    2               on    6
1    3               in    6
2    3       sitting on    2
3    3               on    2
4    3        riding on    2
5    3   to the left of    6
6    3   to the left of    5
7    5               on    2
8    5  to the right of    3
9    6  to the right of    3