Who is standing on the pipe in the picture?
The boy is standing on the pipe.
    src        edge_attr  dst
0     0  to the right of   19
1     1   to the left of    8
2     1   to the left of    7
3     2  to the right of   12
4     5  to the right of   16
5     7  to the right of    1
6     8  to the right of    1
7    12   to the left of    2
8    15            using    4
9    15      standing on   16
10   15          wearing   14
11   15          wearing    2
12   15          wearing   20
13   16   to the left of    5
14   19   to the left of    0