Which kind of furniture is behind the chair?
The piece of furniture is a desk.
    src        edge_attr  dst
0     1           behind    4
1     1   to the left of    4
2     3  to the right of    5
3     3   to the left of    7
4     4      in front of    6
5     4      in front of    1
6     4  to the right of    1
7     4   to the left of    7
8     5       sitting on    1
9     5             near    6
10    5   to the left of    8
11    5   to the left of    3
12    5          next to    6
13    6             near    5
14    6           behind    4
15    6          next to    7
16    6             near    7
17    7             near    6
18    7  to the right of    3
19    7          next to    6
20    7  to the right of    4
21    8  to the right of    5