How are the pieces of furniture that the window is behind of called?
The pieces of furniture are chairs.
    src        edge_attr  dst
0     0   to the left of    5
1     1   to the left of    6
2     1   to the left of    7
3     1          next to    2
4     2               of   16
5     2             near    1
6     2           behind    6
7     3   to the left of   10
8     3               on    7
9     5               on    4
10    5  to the right of    0
11    6               at    7
12    6   to the left of   15
13    6  to the right of    1
14    6      in front of    2
15    6   to the left of    9
16    6   to the left of   13
17    6   to the left of   17
18    6               in   16
19    7   to the left of    9
20    7   to the left of   17
21    7   to the left of   13
22    7  to the right of    1
23    7               in   16
24    7   to the left of   15
25    8   to the left of   14
26    8   to the left of   12
27    9  to the right of    7
28    9  to the right of   17
29    9   to the left of   11
30    9  to the right of    6
31   10  to the right of    3
32   10   to the left of   11
33   11  to the right of   17
34   11  to the right of   10
35   11  to the right of    9
36   12  to the right of   13
37   12  to the right of    8
38   13               on    5
39   13   to the left of   14
40   13  to the right of    7
41   13   to the left of   12
42   13  to the right of    6
43   13            below   15
44   13            under   15
45   14  to the right of    8
46   14  to the right of   13
47   15  to the right of    6
48   15            above   13
49   15  to the right of    7
50   17  to the right of    7
51   17   to the left of   11
52   17  to the right of    6
53   17   to the left of    9