What is the sidewalk near the cone made of?
The sidewalk is made of brick.
    src        edge_attr  dst
0     0       covered by   15
1     4          holding   15
2     4           riding    5
3     4             with   15
4     4               on    5
..  ...              ...  ...
56   18             near   16
57   18   to the left of    4
58   18   to the left of   12
59   18   to the left of   10
60   19  to the right of   17

[61 rows x 3 columns]