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