What is the swimmer doing?
The swimmer is surfing.
    src        edge_attr  dst
0     0               of    7
1     2  to the right of    4
2     3      floating on    1
3     3               on    1
4     4   to the left of    8
5     4   to the left of    2
6     6               of    7
7     7               on    3
8     7          wearing    4
9     8  to the right of    4
10    8               of    7