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