What material is used to make the floor?
The floor is made of cement.
    src        edge_attr  dst
0     0   to the left of    6
1     0  to the right of    5
2     0  to the right of    7
3     1               on    1
4     1           around    4
5     4               on    1
6     5   to the left of    7
7     5   to the left of    6
8     5   to the left of    0
9     6  to the right of    5
10    6  to the right of    0
11    6  to the right of    7
12    7   to the left of    6
13    7  to the right of    5
14    7   to the left of    0