What are the chairs made of?
The chairs are made of leather.
    src        edge_attr  dst
0     0               on   15
1     2  to the right of    6
2     2  to the right of   11
3     2  to the right of   13
4     3  to the right of    8
5     4  to the right of   12
6     4   to the left of   14
7     4     hanging from   16
8     4   to the left of    5
9     5  to the right of   13
10    5  to the right of   12
11    5  to the right of   11
12    5  to the right of   16
13    5  to the right of    4
14    6  to the right of   11
15    6   to the left of    2
16    6  to the right of   13
17    7   to the left of    9
18    7   to the left of   15
19    7   to the left of   10
20    7   on the side of   15
21    8   to the left of    3
22    8  to the right of    9
23    9  to the right of    7
24    9   to the left of    8
25    9  to the right of   10
26   10  to the right of    7
27   10   to the left of    9
28   11   to the left of   14
29   11   to the left of    5
30   11   to the left of    2
31   11   to the left of    6
32   12     hanging from   16
33   12   to the left of    5
34   12   to the left of    4
35   13   to the left of    6
36   13   to the left of    2
37   13   to the left of    5
38   14  to the right of   11
39   14  to the right of    4
40   14     hanging from   16
41   15  to the right of    7
42   16   to the left of    5