Who is riding the bike?
The man is riding a bike.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of    5
2     1  to the right of    6
3     2               on    4
4     3   to the left of    5
5     3   to the left of   12
6     3   to the left of    7
7     3               in    8
8     5               on    4
9     5  to the right of    3
10    5   to the left of    0
11    5  to the right of   10
12    5           riding    4
13    6   to the left of    1
14    7  to the right of    3
15    7   to the left of    0
16    8      in front of    9
17   10               on    8
18   10   to the left of    5
19   10   to the left of   12
20   12  to the right of   10
21   12  to the right of    3