What animal is on top of the street?
The horses are on top of the street.
    src        edge_attr  dst
0     1        on top of    0
1     2   to the left of   10
2     2   to the left of    9
3     3  to the right of    8
4     3  to the right of   12
5     5  to the right of    8
6     5  to the right of    6
7     6   to the left of    5
8     6           behind   10
9     8   to the left of    5
10    8        pulled by   10
11    8        pulled by    9
12    8   to the left of   10
13    8   to the left of    9
14    8   to the left of    3
15    9        on top of    4
16    9  to the right of    8
17    9          pulling    8
18    9  to the right of    2
19    9  to the right of   12
20   10  to the right of   12
21   10          pulling    8
22   10  to the right of    8
23   10  to the right of    2
24   10      in front of    6
25   11          wearing   12
26   12   to the left of    3
27   12   to the left of   10
28   12   to the left of    9