Does the tray have white color?
No, the tray is green.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of   19
2     1  to the right of    5
3     1  to the right of   12
4     1               of    0
5     1  to the right of   19
6     2  to the right of   12
7     4  to the right of   19
8     4  to the right of   12
9     5   to the left of   20
10    5   to the left of    1
11    5   to the left of   14
12   11   to the left of   17
13   12   to the left of    2
14   12   to the left of    4
15   12   to the left of   14
16   12   to the left of   17
17   12   to the left of    0
18   12   to the left of   20
19   12   to the left of   18
20   12   to the left of    1
21   13   to the left of   17
22   14  to the right of    5
23   14  to the right of   19
24   14               on    2
25   14  to the right of   12
26   17  to the right of   13
27   17  to the right of   11
28   17  to the right of   12
29   18  to the right of   19
30   18  to the right of   12
31   19   to the left of   20
32   19   to the left of   18
33   19   to the left of    4
34   19   to the left of    1
35   19   to the left of    0
36   19   to the left of   14
37   20  to the right of   12
38   20  to the right of    5
39   20  to the right of   19