What is the fence made of?
The fence is made of metal.
    src        edge_attr  dst
0     0  to the right of    7
1     1   to the left of    5
2     1  to the right of    3
3     1  to the right of    7
4     3   to the left of    1
5     3  to the right of    7
6     4               on    7
7     5  on the front of    0
8     5  to the right of    1
9     6  on the front of    0
10    6  to the right of    8
11    7   to the left of    8
12    7   to the left of    1
13    7   to the left of    3
14    7   to the left of    0
15    8   to the left of    6
16    8  to the right of    7