Who is riding?
The man is riding.
    src        edge_attr  dst
0     0               by   11
1     0             near   11
2     0  to the right of    4
3     0             near    5
4     0             near    6
5     1   to the left of    5
6     4   to the left of    0
7     4   to the left of   14
8     4   to the left of   13
9     5           beside    0
10    5  to the right of   12
11    5  to the right of    1
12    5          next to    0
13    6  to the right of   13
14    6          next to    0
15    6               by   13
16    7         close to   11
17   11          next to    0
18   11               on    0
19   11               by    0
20   12   to the left of    5
21   12               on    7
22   13  to the right of    4
23   13   to the left of    6
24   14  to the right of    4