Are there any iron benches?
No, there is a bench but it is made of wood.
   src        edge_attr  dst
0    1  to the right of    2
1    2   to the left of    1
2    2   to the left of    4
3    2   to the left of    3
4    3  to the right of    2
5    4  to the right of    2
6    6       sitting on    5