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