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