Which material was used to make the fence that is not new?
The fence is made of metal.
     src        edge_attr  dst
0      0  standing behind    4
1      0  to the right of   23
2      0  to the right of    7
3      0  to the right of    9
4      0  to the right of    2
..   ...              ...  ...
134   23  to the right of   13
135   23  to the right of   17
136   23               on   18
137   23   to the left of   21
138   24   to the left of   12

[139 rows x 3 columns]