Which kind of material is the fence made of?
The fence is made of wood.
    src        edge_attr  dst
0     0  to the right of    7
1     1   to the left of    8
2     2   to the left of   10
3     2   to the left of   13
4     2   to the left of   11
5     3           behind   10
6     3   to the left of   10
7     3   to the left of    4
8     4               on   10
9     4  to the right of    3
10    5  to the right of    7
11    7      in front of   10
12    7   to the left of   10
13    7   to the left of   11
14    7   to the left of   13
15    7   to the left of    0
16    7   to the left of    5
17    8  to the right of    1
18    8  to the right of   10
19    9   to the left of   10
20   10  to the right of    7
21   10   to the left of    8
22   10      in front of   12
23   10      in front of    3
24   10           behind    7
25   10  to the right of    9
26   10  to the right of    2
27   10  to the right of    3
28   10           eating    0
29   11   to the left of   13
30   11  to the right of    7
31   11  to the right of    2
32   12           behind   10
33   13  to the right of   11
34   13  to the right of    7
35   13  to the right of    2