What is the sidewalk made of?
The side walk is made of concrete.
     src        edge_attr  dst
0      0   to the left of   14
1      0        on top of    6
2      0  to the right of   13
3      1   to the left of    4
4      1   to the left of    3
..   ...              ...  ...
126   22   to the left of   13
127   22  to the right of   12
128   22   to the left of   10
129   22  to the right of    5
130   22   to the left of    7

[131 rows x 3 columns]