How clean is the gray floor?
The floor is dirty.
    src        edge_attr  dst
0     0            under    8
1     0  to the right of    4
2     0            below    8
3     1  to the right of   10
4     3   to the left of    8
5     3  to the right of   10
6     4   to the left of    0
7     4  to the right of   12
8     4      in front of    9
9     4       covered by    7
10    4   to the left of    8
11    5   to the left of   14
12    6               on    1
13    6  to the right of   10
14    7  to the right of   12
15    7         covering    4
16    7   to the left of    9
17    8  to the right of    4
18    8  to the right of    3
19    8            above    0
20    9  to the right of   10
21    9           behind    4
22    9  to the right of    7
23   10   to the left of    1
24   10   to the left of    6
25   10   to the left of    3
26   10   to the left of   15
27   10  to the right of   12
28   10   to the left of    9
29   11   to the left of   13
30   12   to the left of   10
31   12   to the left of    4
32   12   to the left of   14
33   12   to the left of    7
34   12   to the left of   13
35   13  to the right of   12
36   13  to the right of   11
37   14  to the right of   12
38   14  to the right of    5
39   15  to the right of   10