What piece of furniture is the cat behind of?
The cat is behind the coffee table.
    src        edge_attr  dst
0     0   to the left of   13
1     0   to the left of    7
2     1           behind   15
3     1             near   15
4     2               on    1
5     2          hung on    1
6     2  to the right of    9
7     2   to the left of    5
8     3   to the left of    4
9     4         watching   15
10    4           behind    8
11    4   to the left of    7
12    4  to the right of    3
13    4  to the right of    8
14    4           facing   15
15    4  to the right of   10
16    5  to the right of    2
17    5   to the left of   12
18    5   to the left of   13
19    5               on    1
20    6   to the left of   14
21    7  to the right of   15
22    7  to the right of    4
23    7  to the right of   14
24    7  to the right of   12
25    7  to the right of    0
26    8   to the left of    4
27    8      in front of    4
28    8            above   10
29    9               on    1
30    9          hung on    1
31    9   to the left of    2
32   10            under    8
33   10   to the left of    4
34   12  to the right of    5
35   12  to the right of   15
36   12   to the left of    7
37   12   to the left of   13
38   12               on    1
39   13  to the right of   14
40   13  to the right of    5
41   13  to the right of    0
42   13  to the right of   12
43   13  to the right of   15
44   14   to the left of    7
45   14  to the right of    6
46   14   to the left of   13
47   15   to the left of    7
48   15             near    1
49   15      in front of    1
50   15   to the left of   13
51   15   to the left of   12