Who is riding the horse?
The officer is riding a horse.
    src        edge_attr  dst
0     0   to the left of   14
1     0  to the right of    9
2     0  to the right of   16
3     0   to the left of   11
4     0  to the right of   10
5     2  to the right of   12
6     3   to the left of   12
7     6               on    4
8     6   to the left of   12
9     6  to the right of    9
10    6          wearing    8
11    6  to the right of   10
12    6  to the right of   16
13    6   to the left of   11
14    6           riding    4
15    6          wearing    3
16    8   to the left of   12
17    8  to the right of   16
18    9  to the right of   16
19    9   to the left of   12
20    9   to the left of    6
21    9   to the left of    0
22    9   to the left of   14
23    9   to the left of   15
24   10   to the left of   15
25   10   to the left of   14
26   10   to the left of   12
27   10  to the right of   16
28   10   to the left of    6
29   10   to the left of    0
30   11  to the right of    0
31   11  to the right of    6
32   11  to the right of   15
33   11  to the right of   14
34   12  to the right of   10
35   12  to the right of    6
36   12  to the right of    3
37   12  to the right of    8
38   12   to the left of    2
39   12  to the right of    9
40   14   to the left of   11
41   14  to the right of    0
42   14  to the right of   10
43   14  to the right of   15
44   14  to the right of    9
45   15  to the right of   10
46   15   to the left of   11
47   15  to the right of    9
48   15   to the left of   14
49   16   to the left of    6
50   16   to the left of    8
51   16   to the left of   10
52   16   to the left of    0
53   16   to the left of    9
54   17               on    4