Of which color are the rectangular plates?
The plates are black.
    src        edge_attr  dst
0     0  to the right of    4
1     0               on   12
2     1  to the right of   10
3     1  to the right of    2
4     1  to the right of    7
5     1  to the right of    5
6     1  to the right of    6
7     2   to the left of    1
8     2   to the left of    6
9     2   to the left of    3
10    2  to the right of    8
11    3  to the right of    7
12    3  to the right of    2
13    3  to the right of   10
14    3  to the right of    6
15    3  to the right of    5
16    4   to the left of    0
17    4               on   12
18    5  to the right of    8
19    5   to the left of    1
20    5   to the left of    3
21    5   to the left of    6
22    6  to the right of    8
23    6   to the left of    1
24    6   to the left of    3
25    6  to the right of    5
26    6  to the right of    7
27    6  to the right of    2
28    7   to the left of    3
29    7   to the left of    1
30    7               on    3
31    7  to the right of    8
32    7   to the left of    6
33    8   to the left of    2
34    8   to the left of    7
35    8   to the left of    6
36    8   to the left of    5
37    9               on   12
38    9   to the left of   11
39   10               on   12
40   10   to the left of    1
41   10   to the left of    3
42   11  to the right of    9