What is the floor made of?
The floor is made of concrete.
    src        edge_attr  dst
0     0  to the right of   11
1     0   to the left of    9
2     0               on   11
3     0          next to   11
4     0               on    1
5     0           beside   11
6     1   to the left of    9
7     3          next to    9
8     3   to the left of    9
9     3               on    1
10    5   to the left of    9
11    5               in    2
12    8   to the left of    9
13    9             near    3
14    9  to the right of    8
15    9  to the right of    0
16    9  to the right of   11
17    9  to the right of    3
18    9  to the right of    5
19    9  to the right of   10
20    9  to the right of    1
21   10   to the left of    9
22   11   to the left of    0
23   11   to the left of    9
24   11             near    0