What is the sidewalk made of?
The sidewalk is made of brick.
     src        edge_attr  dst
0      0               on    5
1      0   to the left of   18
2      0  to the right of   13
3      1  to the right of    2
4      1  to the right of    5
..   ...              ...  ...
101   21   to the left of   22
102   22  to the right of   19
103   22  to the right of   21
104   22  to the right of    4
105   22   to the left of   15

[106 rows x 3 columns]