What is the ground made of?
The ground is made of brick.
     src        edge_attr  dst
0      0          wearing    5
1      0   to the left of    6
2      0   to the left of   12
3      0   to the left of   11
4      0   to the left of   16
..   ...              ...  ...
133   26   to the left of   23
134   26  to the right of    4
135   26  to the right of    5
136   26   to the left of   14
137   26   to the left of   15

[138 rows x 3 columns]