What pieces of furniture are behind the vase?
The pieces of furniture are chairs.
    src        edge_attr  dst
0     0   to the left of   11
1     0   to the left of    2
2     1  to the right of    2
3     2   to the left of    6
4     2  to the right of   11
5     2   to the left of    4
6     2  to the right of    0
7     2   to the left of    1
8     4               on    5
9     4  to the right of    2
10    5           behind   10
11    5  to the right of    7
12    6  to the right of    2
13    6       sitting at    3
14    7   to the left of    5
15    7           behind   10
16    8           behind   10
17    9           inside   10
18   10      in front of    8
19   10        on top of    3
20   10      in front of    5
21   10      in front of    7
22   11  to the right of    0
23   11   to the left of    2