What material is the fence made of?
The fence is made of metal.
    src        edge_attr  dst
0     0   to the left of   11
1     0   to the left of    8
2     1   to the left of    8
3     1   to the left of    7
4     1   to the left of   11
5     2  to the right of    5
6     2   to the left of    4
7     2  to the right of   10
8     3               of    8
9     3  to the right of   11
10    4  to the right of   12
11    4             near   12
12    4  to the right of    2
13    4  to the right of   11
14    4  to the right of    5
15    5   to the left of    2
16    5   to the left of    4
17    5             near    8
18    5   to the left of   12
19    5          wearing   10
20    6               of    5
21    7               of    8
22    7  to the right of    1
23    7   to the left of    9
24    8             near    5
25    8  to the right of    0
26    8  to the right of    1
27    9  to the right of    7
28    9  to the right of   11
29   10   to the left of    2
30   10               of    5
31   11  to the right of    1
32   11  to the right of    0
33   11   to the left of    9
34   11   to the left of    4
35   11   to the left of    3
36   12  to the right of    5
37   12   to the left of    4
38   12             near    4