What is the horse on?
The horse is on the chair.
    src        edge_attr  dst
0     0               in    2
1     0   to the left of    4
2     0  to the right of    2
3     0   to the left of    8
4     0  to the right of    6
5     1   to the left of    8
6     1               on    0
7     1  to the right of    6
8     2               on    3
9     2               on    0
10    2   to the left of    0
11    2   to the left of   12
12    4  to the right of    5
13    4  to the right of    0
14    5   to the left of    8
15    5   to the left of    4
16    6   to the left of    1
17    6   to the left of    0
18    6   to the left of   11
19    6   to the left of   10
20    8  to the right of   10
21    8  to the right of    5
22    8  to the right of    1
23    8  to the right of   11
24    8  to the right of    0
25   10  to the right of    6
26   10   to the left of    8
27   11  to the right of    6
28   11   to the left of    8
29   12  to the right of    2