Is this fence made of metal?
No, the fence is made of wood.
    src        edge_attr  dst
0     0        on top of   11
1     0   to the left of   12
2     0  to the right of    4
3     0  to the right of    6
4     1  to the right of    4
5     2   to the left of    5
6     4   to the left of    0
7     4   to the left of    9
8     4   to the left of    1
9     5  to the right of    2
10    6   to the left of    7
11    6   to the left of    0
12    7  to the right of    6
13    8   to the left of   12
14    9  to the right of    4
15   10  to the right of   11
16   11   to the left of   10
17   12  to the right of    8
18   12  to the right of    0