Who is riding on the snow board?
The boy is riding on the snow board.
    src        edge_attr  dst
0     1   to the left of   15
1     2   to the left of    3
2     3  to the right of    2
3     5  to the right of   11
4     5  to the right of   15
5     5               on    6
6     8  to the right of   13
7     8  to the right of   16
8     8  to the right of   10
9    10   to the left of   15
10   10   to the left of    8
11   11  to the right of   15
12   11   to the left of    5
13   12   to the left of   15
14   13   to the left of    8
15   13   to the left of   15
16   14          wearing    1
17   14   to the left of   15
18   15  to the right of   12
19   15  to the right of   10
20   15  to the right of   13
21   15   to the left of   11
22   15  to the right of    1
23   15   to the left of    5
24   15        riding on    4
25   15          wearing    3
26   15  to the right of   16
27   15  to the right of   14
28   16   to the left of   15
29   16   to the left of    8