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