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