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