Which material is the ground made of, brick or plastic?
The ground is made of brick.
    src        edge_attr  dst
0     0   to the left of    7
1     0            below    2
2     0   to the left of   20
3     0   to the left of    6
4     0   to the left of   11
..  ...              ...  ...
79   20   to the left of   16
80   20  to the right of   11
81   20   to the left of    4
82   20   to the left of    1
83   20  to the right of    5

[84 rows x 3 columns]