What piece of furniture is not ceramic?
The piece of furniture is a shelf.
    src        edge_attr  dst
0     1   to the left of   10
1     1  to the right of   14
2     1   to the left of    2
3     1   to the left of   11
4     1   to the left of   13
5     2  to the right of    1
6     2  to the right of   11
7     2  to the right of   13
8    10  to the right of   14
9    10  to the right of    1
10   10  to the right of   13
11   11   to the left of    2
12   11  to the right of   14
13   11   to the left of   17
14   11  to the right of   13
15   11  to the right of    1
16   12  to the right of   14
17   13  to the right of    1
18   13   to the left of    2
19   13  to the right of   14
20   13   to the left of   11
21   13   to the left of   17
22   13   to the left of   10
23   14               on    8
24   14   to the left of   12
25   14   to the left of    1
26   14   to the left of   11
27   14   to the left of   13
28   14   to the left of   10
29   17  to the right of   13
30   17  to the right of   11