What was used to make the fence, wire or stone?
The fence is made of stone.
    src        edge_attr  dst
0     0  to the right of   17
1     2   to the left of   15
2     2  to the right of   19
3     2  to the right of   16
4     2  to the right of   23
..  ...              ...  ...
89   23   to the left of    2
90   23   to the left of   15
91   23   to the left of   13
92   23   to the left of    3
93   23   to the left of    5

[94 rows x 3 columns]