Are the shelves made of stainless steel?
Yes, the shelves are made of stainless steel.
    src        edge_attr  dst
0     1   to the left of   16
1     1   to the left of    9
2     2   to the left of   15
3     2   to the left of    5
4     3   to the left of    9
5     3   to the left of   16
6     4   to the left of   12
7     4   to the left of   13
8     5   to the left of   18
9     5  to the right of    2
10    8            below   15
11    8            under   15
12    8  to the right of   19
13    8   to the left of   12
14    8  to the right of   10
15    9  to the right of    1
16    9  to the right of   11
17    9  to the right of   16
18    9  to the right of    3
19   10   to the left of   12
20   10   to the left of    8
21   11   to the left of    9
22   11   to the left of   16
23   12  to the right of   15
24   12  to the right of    4
25   12  to the right of   18
26   12  to the right of   19
27   12  to the right of    8
28   12  to the right of   10
29   13  to the right of   18
30   13  to the right of    4
31   13  to the right of   15
32   13  to the right of   19
33   15   to the left of   12
34   15  to the right of    2
35   15            above    8
36   15   to the left of   13
37   16  to the right of    1
38   16  to the right of    3
39   16  to the right of   11
40   16   to the left of    9
41   18   to the left of   13
42   18   to the left of   12
43   18  to the right of    5
44   19   to the left of   12
45   19   to the left of   13
46   19   to the left of    8