Which kind of furniture is wooden?
The furniture is a shelf.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of    7
2     1  to the right of    7
3     1  to the right of    6
4     2  to the right of    6
5     5  to the right of    7
6     5  to the right of    6
7     6  to the right of    0
8     6   to the left of    2
9     6   to the left of    1
10    6   to the left of    5
11    7  to the right of    0
12    7   to the left of    1
13    7   to the left of    5