What's the floor made of?
The floor is made of concrete.
    src        edge_attr  dst
0     0  to the right of    7
1     1  to the right of    9
2     1   to the left of    5
3     1   to the left of    6
4     2               on    8
5     2            above   10
6     3  to the right of   10
7     4  to the right of   10
8     4               on    3
9     5  to the right of    9
10    5   to the left of    6
11    5  to the right of    1
12    6  to the right of    1
13    6  to the right of    5
14    7   to the left of   10
15    7   to the left of    0
16    9   to the left of    1
17    9   to the left of    5
18   10            under    2
19   10   to the left of    4
20   10   to the left of    3
21   10  to the right of    7