Which kind of furniture is wooden?
The furniture is a desk.
    src        edge_attr  dst
0     0  to the right of   13
1     2   to the left of    7
2     2   to the left of    6
3     2  to the right of   13
4     3  to the right of   13
5     4  to the right of   13
6     6  to the right of    2
7     6  to the right of   12
8     7  to the right of    2
9     7  to the right of   12
10   12   to the left of    6
11   12   to the left of    7
12   13   to the left of    4
13   13   to the left of    2
14   13   to the left of    0
15   13   to the left of    3
16   13             near   14
17   14        on top of   11
18   14             near   13