Which kind of furniture is gray?
The furniture is drawers.
    src        edge_attr  dst
0     1   to the left of   11
1     1  to the right of   15
2     1  to the right of    6
3     2   to the left of   16
4     2   to the left of   11
5     2   to the left of   10
6     2  to the right of    6
7     3   to the left of    7
8     3   to the left of   20
9     3   to the left of   12
10    3   to the left of    8
11    4  to the right of   19
12    5   to the left of   12
13    5   to the left of    7
14    5   to the left of   20
15    5   to the left of    8
16    6   to the left of   15
17    6   to the left of   17
18    6   to the left of    1
19    6   to the left of    2
20    7  to the right of    5
21    7  to the right of    3
22    7   to the left of   18
23    7  to the right of   12
24    8  to the right of    5
25    8  to the right of    3
26    8   to the left of   18
27    9  to the right of   13
28   10  to the right of    2
29   10   to the left of   16
30   11  to the right of    2
31   11  to the right of    1
32   11  to the right of   17
33   11  to the right of   15
34   11       covered by   16
35   12  to the right of    5
36   12   to the left of    7
37   12  to the right of    3
38   13   to the left of   18
39   13   to the left of    9
40   15   to the left of   11
41   15   to the left of   16
42   15   to the left of    1
43   15   to the left of   17
44   15  to the right of    6
45   16  to the right of    2
46   16  to the right of   10
47   16  to the right of   15
48   17  to the right of    6
49   17  to the right of   15
50   17   to the left of   11
51   18  to the right of    8
52   18  to the right of   20
53   18  to the right of    7
54   18  to the right of   13
55   19   to the left of    4
56   20  to the right of    3
57   20  to the right of    5
58   20   to the left of   18