Who is using the skateboard?
The boy is using the skateboard.
    src        edge_attr  dst
0     1  to the right of    6
1     1  to the right of    5
2     2   to the left of   16
3     2  to the right of    8
4     3   to the left of    7
5     3  to the right of    4
6     3   to the left of   12
7     3  to the right of   10
8     3   to the left of   16
9     4   to the left of    7
10    4          wearing    0
11    4   to the left of    3
12    5        riding on   17
13    5          wearing    7
14    5          wearing    6
15    5   to the left of    1
16    5          wearing    3
17    5            using   17
18    5          wearing   11
19    5          wearing   15
20    5          wearing    9
21    5          wearing   14
22    5          wearing    8
23    5   to the left of   16
24    6   to the left of    1
25    6  to the right of    9
26    7  to the right of    3
27    7  to the right of   10
28    7  to the right of    4
29    8   to the left of   16
30    8          wearing    2
31    8   to the left of    2
32    9   to the left of    6
33    9   to the left of   11
34   10   to the left of    3
35   10   to the left of    7
36   11  to the right of    9
37   12  to the right of    3
38   12   to the left of   13
39   13  to the right of   12
40   16  to the right of    2
41   16  to the right of    3
42   16  to the right of    8
43   16  to the right of    5