Who is riding a horse?
The jockey is riding a horse.
    src        edge_attr  dst
0     1  to the right of    5
1     2  to the right of   12
2     3   to the left of    6
3     4   to the left of    5
4     4   to the left of    6
5     5   to the left of    7
6     5           riding    6
7     5  to the right of   11
8     5  to the right of    4
9     5   to the left of    1
10    6  to the right of    3
11    6   to the left of    7
12    6  to the right of    4
13    6   to the left of   10
14    7  to the right of    6
15    7  to the right of    5
16   10  to the right of    6
17   11   to the left of    5
18   12   to the left of    2