What makes up the fence by the pole, wood or metal?
The fence is made of wood.
    src        edge_attr  dst
0     1   to the left of    8
1     2  to the right of    8
2     5  to the right of    8
3     7  to the right of   13
4     8   to the left of   12
5     8   to the left of    2
6     8   to the left of    5
7     8  to the right of    1
8    12  to the right of    8
9    12   to the left of   13
10   13  to the right of   12
11   13   to the left of    7
12   14               by   13
13   15               on    8