What's the fence made of?
The fence is made of wood.
    src        edge_attr  dst
0     0  to the right of   19
1     1   to the left of   14
2     1   to the left of   10
3     2   to the left of    6
4     2   to the left of    3
..  ...              ...  ...
80   19   to the left of    8
81   19   to the left of   10
82   19   to the left of   14
83   19   to the left of    7
84   19   to the left of    0

[85 rows x 3 columns]