Which kind of furniture is wooden?
The furniture is a bed.
    src        edge_attr  dst
0     1   to the left of    7
1     1   to the left of    2
2     1       hanging on    3
3     1   to the left of   14
4     2  to the right of    1
5     4        on top of   12
6     4  to the right of    8
7     4  to the right of    6
8     4  to the right of   15
9     4  to the right of    9
10    5  to the right of   15
11    5  to the right of    9
12    6  to the right of    8
13    6   to the left of    4
14    6  to the right of   15
15    6  to the right of    9
16    7  to the right of    1
17    8   to the left of    6
18    8   to the left of    4
19    8        on top of    9
20    8   to the left of   12
21    9   to the left of    6
22    9   to the left of    4
23    9   to the left of    5
24    9   to the left of   12
25   12  to the right of   15
26   12  to the right of    9
27   12  to the right of    8
28   14  to the right of    1
29   15   to the left of    6
30   15   to the left of    4
31   15   to the left of    5
32   15   to the left of   12