What is the sidewalk made of?
The sidewalk is made of concrete.
    src        edge_attr  dst
0     0          wearing   17
1     0               on   18
2     0   to the left of   22
3     0   to the left of   11
4     0  to the right of    1
..  ...              ...  ...
58   22  to the right of    6
59   22  to the right of   23
60   23  to the right of   12
61   23   to the left of   22
62   23   to the left of    6

[63 rows x 3 columns]