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