What is the fence made of?
The fence is made of metal.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of   23
2     1   to the left of    2
3     1   to the left of   14
4     2               on   14
5     2  to the right of   11
6     2  to the right of    1
7     2  to the right of    3
8     3               on    1
9     3   to the left of    2
10    3   to the left of   14
11    3  to the right of   11
12    4  to the right of    7
13    4  to the right of   12
14    5  to the right of   12
15    5  to the right of    6
16    6   to the left of    5
17    6  to the right of   12
18    7   to the left of   20
19    7  to the right of   12
20    7   to the left of    4
21    8               on   16
22    9   to the left of   16
23    9               on   11
24   11   to the left of    3
25   11   to the left of   16
26   11   to the left of    2
27   12   to the left of    4
28   12   to the left of    5
29   12   to the left of    6
30   12   to the left of    7
31   12   to the left of   20
32   12  to the right of    0
33   12  to the right of   23
34   12   to the left of   19
35   12   to the left of   13
36   12   to the left of   18
37   12   to the left of   25
38   13  to the right of   19
39   13  to the right of   12
40   13             near   18
41   14  to the right of    3
42   14  to the right of    1
43   15               on   10
44   16  to the right of    9
45   16  to the right of   11
46   18          next to   13
47   18  to the right of   12
48   19  to the right of   12
49   19  to the right of   23
50   19   to the left of   13
51   20  to the right of    7
52   20  to the right of   12
53   23   to the left of   19
54   23   to the left of   12
55   23  to the right of    0
56   24               on   22
57   25  to the right of   12