What's the fence made of?
The fence is made of metal.
    src        edge_attr  dst
0     0  to the right of    5
1     2  to the right of    6
2     2  to the right of    5
3     3  to the right of    6
4     3  to the right of    5
5     4        on top of   13
6     4  to the right of    5
7     4  to the right of   14
8     4               on   13
9     4  to the right of    6
10    5   to the left of    2
11    5   to the left of    0
12    5   to the left of    4
13    5   to the left of    3
14    5   to the left of   11
15    5   to the left of   10
16    6   to the left of    3
17    6   to the left of    2
18    6   to the left of    4
19    6   to the left of   10
20    8  to the right of   10
21   10  to the right of    5
22   10  to the right of    6
23   10   to the left of    8
24   11  to the right of    5
25   14   to the left of    4