Which kind of furniture is black?
The furniture is an office chair.
    src        edge_attr  dst
0     0  to the right of    9
1     1  to the right of    3
2     1   to the left of    7
3     2   to the left of   11
4     2   to the left of    8
5     3   to the left of    1
6     3   to the left of   10
7     4   to the left of   11
8     5   to the left of   10
9     7  to the right of    1
10    7  to the right of    8
11    7  to the right of   11
12    8   to the left of   11
13    8  to the right of    2
14    8   to the left of    7
15    9   to the left of    0
16   10  to the right of    5
17   10  to the right of    3
18   11   to the left of    7
19   11  to the right of    4
20   11  to the right of    8
21   11  to the right of    2