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