What material is the fence that is not tall made of?
The fence is made of metal.
     src        edge_attr  dst
0      0  to the right of    6
1      0   to the left of   21
2      1  to the right of   22
3      1   to the left of   15
4      1  to the right of   13
..   ...              ...  ...
111   24               of   10
112   25               of   10
113   25  to the right of   20
114   25  to the right of   17
115   25   to the left of   18

[116 rows x 3 columns]