What is the horse in the field surrounded by?
The horse is surrounded by the fence.
    src        edge_attr  dst
0     0   to the left of   10
1     0   to the left of    6
2     0  to the right of    3
3     0   to the left of    1
4     0   to the left of    5
5     0   to the left of    4
6     1               in    7
7     1   to the left of    9
8     1    surrounded by    4
9     1             near   10
10    1               by    0
11    1           eating    3
12    1  to the right of   13
13    1   to the left of   10
14    1  to the right of    0
15    3   to the left of    0
16    3   to the left of   13
17    4  to the right of   13
18    4      surrounding    1
19    4  to the right of    0
20    5  to the right of    0
21    5  to the right of   13
22    5   to the left of    6
23    6   to the left of    9
24    6  to the right of    5
25    6  to the right of    0
26    6  to the right of   13
27    8   to the left of   12
28    9  to the right of   12
29    9  to the right of    1
30    9  to the right of   10
31    9  to the right of    6
32   10   to the left of    9
33   10  to the right of   12
34   10          next to    1
35   10  to the right of   15
36   10  to the right of    0
37   10  to the right of    1
38   10  to the right of   13
39   11   to the left of   12
40   12   to the left of    9
41   12  to the right of    8
42   12   to the left of   10
43   12  to the right of   11
44   12  to the right of   16
45   13   to the left of    1
46   13   to the left of   10
47   13  to the right of    3
48   13   to the left of    4
49   13   to the left of    5
50   13   to the left of    6
51   15   to the left of   10
52   16   to the left of   12