What animal is standing on the green field?
The horse is standing on the field.
    src        edge_attr  dst
0     0   to the left of    1
1     1      standing on    9
2     1  to the right of    0
3     1   to the left of    6
4     1  to the right of    4
5     1       running on    9
6     1  to the right of   12
7     1   to the left of   10
8     2  to the right of   12
9     2   to the left of    3
10    2   to the left of    8
11    3  to the right of    2
12    3  to the right of   12
13    3   to the left of    8
14    4   to the left of    7
15    4   to the left of    1
16    4   to the left of    5
17    5  to the right of   12
18    5  to the right of    4
19    6  to the right of    1
20    7  to the right of   12
21    7  to the right of    4
22    8  to the right of   12
23    8   to the left of   10
24    8  to the right of    3
25    8  to the right of    2
26   10  to the right of    8
27   10  to the right of    1
28   10      standing on    9
29   10       running on    9
30   11  to the right of   12
31   12   to the left of    3
32   12   to the left of    2
33   12   to the left of    1
34   12   to the left of    5
35   12   to the left of    7
36   12      standing on    9
37   12   to the left of   11
38   12   to the left of    8
39   12       running on    9