What's the sidewalk made of?
The sidewalk is made of concrete.
     src        edge_attr  dst
0      0   to the left of    2
1      0   to the left of   12
2      0  to the right of   19
3      1   to the left of    2
4      1   to the left of    5
..   ...              ...  ...
107   24   to the left of   19
108   24   to the left of   23
109   24   to the left of    3
110   24   to the left of   18
111   25   to the left of   11

[112 rows x 3 columns]