What is covered in trash?
The floor is covered in trash.
    src        edge_attr  dst
0     0           behind    8
1     1               on    6
2     1  to the right of    7
3     2   to the left of    3
4     2   to the left of    8
5     3               on    6
6     3  to the right of    8
7     3  to the right of    2
8     6       covered in    2
9     6       covered in    7
10    7               on    6
11    7   to the left of    1
12    8   to the left of    3
13    8  to the right of    2
14    8               in    5
15    8      in front of    0
16    8      in front of    9
17    9           behind    8