What is the floor made of?
The floor is made of concrete.
    src        edge_attr  dst
0     0  to the right of    1
1     0   to the left of    6
2     1   to the left of    0
3     1   to the left of    8
4     1   to the left of    3
5     3  to the right of    1
6     4   on the side of    8
7     5   on the side of    8
8     6  to the right of    0
9     8        parked in   11
10    8            below   11
11    8  to the right of    1
12    8       covered in    3
13    8   to the left of    9
14    8       covered in    6
15    9  to the right of    8
16    9           inside   11