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