What animals are the people riding?
The people are riding horses.
    src        edge_attr  dst
0     0  to the right of    2
1     0  to the right of    1
2     0  to the right of   10
3     1               on   10
4     1           riding   10
5     1           riding   11
6     1  to the right of    8
7     1   to the left of   13
8     1   to the left of    0
9     2   to the left of   13
10    2   to the left of   11
11    2   to the left of    0
12    2  to the right of    8
13    3               of   11
14    3  to the right of   10
15    4  to the right of    7
16    4  to the right of    6
17    4  to the right of   10
18    6   to the left of   11
19    6   to the left of    7
20    6   to the left of    4
21    7   to the left of    4
22    7  to the right of    6
23    7  to the right of   10
24    8               of   11
25    8   to the left of    1
26    8   to the left of    2
27    8   to the left of   13
28   10               in    9
29   10   to the left of    0
30   10               on    9
31   10   to the left of    3
32   10   to the left of   11
33   10   to the left of    7
34   10   to the left of    4
35   10   to the left of   13
36   11  to the right of    2
37   11  to the right of    6
38   11  to the right of   10
39   11  to the right of   12
40   11               on    9
41   11               in    9
42   12   to the left of   11
43   13  to the right of    1
44   13  to the right of    2
45   13  to the right of   10
46   13  to the right of    8