Are the side walk and the pole made of the same material?
Yes, both the side walk and the pole are made of concrete.
   src        edge_attr  dst
0    1   to the left of    2
1    2  to the right of    3
2    2   to the left of    7
3    2   to the left of    5
4    2  to the right of    1
5    3   to the left of    2
6    5  to the right of    2
7    7  to the right of    2