Who is in front of the skateboard?
The guy is in front of the skateboard.
    src        edge_attr  dst
0     0   to the left of    9
1     0  to the right of    1
2     0  to the right of   19
3     1   to the left of    0
4     2  to the right of   14
5     4  to the right of   12
6     5   to the left of   12
7     7   to the left of   14
8     8  to the right of   12
9     8           behind   17
10    9  to the right of    0
11    9  to the right of   11
12    9           behind   17
13   10   to the left of   15
14   10   to the left of   14
15   11   to the left of    9
16   12   to the left of    4
17   12  to the right of    5
18   12   to the left of    8
19   13   to the left of   20
20   13   to the left of   14
21   14  to the right of   15
22   14   to the left of    2
23   14  to the right of   13
24   14  to the right of   18
25   14  to the right of   19
26   14  to the right of    7
27   14  to the right of   10
28   15  to the right of   18
29   15   to the left of   14
30   15  to the right of   10
31   17      in front of    8
32   17      in front of    9
33   18   to the left of   15
34   18   to the left of   14
35   19   to the left of    0
36   19   to the left of   14
37   20  to the right of   13