Which kind of furniture is empty?
The furniture is a bed.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    6
2     0   to the left of    7
3     1           around    1
4     1            under    4
5     1  to the right of    2
6     1            below    4
7     2   to the left of    1
8     3  to the right of    6
9     3  to the right of    4
10    3  to the right of    0
11    3  to the right of    5
12    4   to the left of    3
13    5   to the left of    6
14    5   to the left of    3
15    5   to the left of    7
16    6       hanging on    7
17    6   to the left of    3
18    6  to the right of    0
19    6  to the right of    5
20    7  to the right of    0
21    7  to the right of    5
22    8     hanging from    0