What is the fence made of?
The fence is made of metal.
     src        edge_attr  dst
0      0  to the right of   16
1      0  to the right of   12
2      0  to the right of   18
3      0  to the right of    7
4      0  to the right of    6
..   ...              ...  ...
113   21  to the right of   17
114   21  to the right of    5
115   21  to the right of    3
116   21  to the right of   20
117   22  to the right of    7

[118 rows x 3 columns]