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