Is the wall behind a bed?
No, the wall is behind the boy.
    src        edge_attr  dst
0     0           behind   12
1     0          wearing    6
2     0      in front of    2
3     0       sitting at   11
4     0   to the left of    1
5     0   to the left of   14
6     0      in front of    3
7     1       hanging on    3
8     1  to the right of    0
9     2           behind    0
10    3           behind    0
11    4        on top of   12
12    4   to the left of   10
13    4  to the right of    7
14    5        on top of   11
15    5        on top of   12
16    5       stacked on   12
17    5   to the left of   10
18    5  to the right of    7
19    5   to the left of   15
20    6   to the left of   14
21    7       sitting on   11
22    7          next to   12
23    7             near   12
24    7        on top of   11
25    7   to the left of   12
26    7   to the left of    5
27    7   to the left of    4
28   10        on top of   12
29   10  to the right of    5
30   10  to the right of    4
31   12      in front of    0
32   12             near    7
33   12  to the right of    7
34   13   to the left of   16
35   13   to the left of   14
36   14  to the right of    6
37   14  to the right of   13
38   14  to the right of    0
39   15        on top of   12
40   15  to the right of    5
41   16  to the right of   18
42   16  to the right of   19
43   16  to the right of   13
44   18   to the left of   16
45   18  to the right of   19
46   19   to the left of   16
47   19   to the left of   18