Who is on the surfboard?
The boy is on the surfboard.
    src        edge_attr  dst
0     0               of    1
1     0  to the right of    8
2     0  to the right of    4
3     1               in    2
4     1        riding on   13
5     1               on   13
6     3   to the left of   12
7     4               of    1
8     4   to the left of    0
9     5   to the left of   12
10    5               of    1
11    6               of    1
12    6   to the left of   10
13    6   to the left of   12
14    7               of    1
15    8               of    1
16    8   to the left of    0
17    9               of    1
18    9  to the right of   10
19   10  to the right of    6
20   10   to the left of    9
21   10               of    1
22   11   to the left of   12
23   12  to the right of   11
24   12  to the right of    6
25   12  to the right of    5
26   12  to the right of    3