What is the sidewalk made of?
The sidewalk is made of brick.
     src        edge_attr  dst
0      0   to the left of    3
1      0          wearing    2
2      0   to the left of    8
3      1  to the right of   11
4      1  to the right of    4
..   ...              ...  ...
139   27   to the left of   21
140   27   to the left of   23
141   27   to the left of   24
142   27  to the right of   25
143   27   to the left of    8

[144 rows x 3 columns]