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