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