What is the fence made of?
The fence is made of wood.
    src        edge_attr  dst
0     0  to the right of   18
1     0   to the left of    7
2     1   to the left of    9
3     2   to the left of    9
4     5  to the right of    9
..  ...              ...  ...
61   18   to the left of   14
62   18             near   13
63   18   to the left of    9
64   18   to the left of    8
65   18   to the left of   15

[66 rows x 3 columns]