Who is riding the horse?
The man is riding a horse.
    src        edge_attr  dst
0     0   to the left of   17
1     0  to the right of    3
2     0  to the right of   13
3     1   to the left of    9
4     1            above    9
5     3  to the right of   13
6     3   to the left of    0
7     3  to the right of   21
8     3   to the left of    7
9     4   to the left of    9
10    5  to the right of   14
11    5  to the right of   13
12    6         lying on   15
13    6  to the right of   11
14    6  to the right of   18
15    6  to the right of   19
16    7          holding   17
17    7           riding   19
18    7  to the right of    3
19    7  to the right of   13
20    7  to the right of   14
21    8   to the left of    9
22    9  to the right of    8
23    9  to the right of    1
24    9  to the right of    4
25   10  to the right of   13
26   10  to the right of   14
27   11  to the right of   18
28   11   to the left of    6
29   13   to the left of    3
30   13   to the left of    5
31   13   to the left of    0
32   13   to the left of    7
33   13   to the left of   10
34   13   to the left of   16
35   14   to the left of   16
36   14   to the left of    5
37   14   to the left of   10
38   14   to the left of    7
39   16  to the right of   14
40   16  to the right of   13
41   17  to the right of    0
42   18   to the left of    6
43   18   to the left of   11
44   19   to the left of    6
45   21   to the left of    3