What is the sidewalk made of?
The sidewalk is made of brick.
     src        edge_attr  dst
0      0   to the left of   12
1      2   to the left of   19
2      2  to the right of   21
3      2  to the right of    4
4      2  to the right of   13
..   ...              ...  ...
129   29   to the left of   27
130   29   to the left of   10
131   29   to the left of   28
132   29   to the left of    6
133   29  to the right of   24

[134 rows x 3 columns]