What is the man on?
The man is on the skateboard.
    src        edge_attr  dst
0     0  to the right of   11
1     1  to the right of   13
2     5   to the left of    7
3     7  to the right of    5
4    10          wearing    9
5    10        riding on   14
6    10               on   14
7    10          wearing    8
8    10          wearing   11
9    11   to the left of    0
10   13   to the left of    1