Which kind of material is the chair made of?
The chair is made of wood.
    src        edge_attr  dst
0     0   to the left of   15
1     0  to the right of    1
2     1   to the left of    6
3     1   to the left of    0
4     2  to the right of    8
5     3  to the right of    5
6     3   to the left of    9
7     3   to the left of   17
8     5               on    6
9     5   to the left of    3
10    5   to the left of   13
11    5   to the left of    6
12    6  to the right of    1
13    6  to the right of    5
14    6   to the left of   15
15    8   to the left of    2
16    8  to the right of   10
17    9  to the right of   13
18    9  to the right of   17
19    9  to the right of   16
20    9  to the right of    3
21   10               on    9
22   10   to the left of   12
23   10   to the left of    8
24   12               on    8
25   12  to the right of   14
26   12  to the right of   10
27   13   to the left of    9
28   13  to the right of    5
29   14   to the left of   12
30   15  to the right of    0
31   15  to the right of    6
32   16   to the left of    9
33   17   to the left of    9
34   17  to the right of    3
35   17               on   16