Which kind of furniture is the mattress covering?
The mattress is covering the bed.
    src        edge_attr  dst
0     0   to the left of   16
1     0   to the left of    7
2     0   to the left of   19
3     1  to the right of    5
4     1   to the left of   16
5     1        on top of    0
6     2         covering   12
7     4         covering   12
8     5   to the left of   16
9     5   to the left of    1
10    6      hanging off   12
11    7  to the right of   16
12    7  to the right of    0
13    8               on    3
14    8  to the right of   10
15    8   to the left of   16
16    9   to the left of   16
17   10   to the left of    8
18   10   to the left of   16
19   11               on   12
20   11  to the right of   16
21   11  to the right of   19
22   12       covered by    2
23   12       covered by    4
24   13  to the right of   18
25   13  to the right of   19
26   13  to the right of   16
27   14               on   12
28   14  to the right of   16
29   14  to the right of   19
30   15   to the left of   19
31   15   to the left of   16
32   16  to the right of    0
33   16  to the right of    1
34   16   to the left of   11
35   16   to the left of   14
36   16   to the left of   18
37   16  to the right of   15
38   16  to the right of    8
39   16   to the left of    7
40   16  to the right of    9
41   16  to the right of    5
42   16  to the right of   10
43   16   to the left of   19
44   16   to the left of   13
45   18   to the left of   13
46   18  to the right of   16
47   19   to the left of   14
48   19   to the left of   11
49   19  to the right of    0
50   19  to the right of   16
51   19   to the left of   13
52   19  to the right of   15