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