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