What is the wet floor made of?
The floor is made of concrete.
    src        edge_attr  dst
0     0  to the right of    6
1     0  to the right of   15
2     1   to the left of   11
3     2  to the right of    6
4     3   to the left of    6
5     3   to the left of   13
6     4   to the left of   14
7     5  to the right of    6
8     6  to the right of    7
9     6  to the right of    9
10    6   to the left of    5
11    6   to the left of   14
12    6   to the left of    0
13    6   to the left of   11
14    6   to the left of    2
15    6   to the left of    8
16    6  to the right of    3
17    7   to the left of    6
18    8  to the right of    6
19    9   to the left of    6
20   10            below   14
21   11  to the right of    6
22   11  to the right of    1
23   13  to the right of    3
24   14  to the right of   15
25   14  to the right of    6
26   14  to the right of    4
27   15   to the left of    0
28   15   to the left of   14