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my %lookup = {
    ##           0     1     2       3     4      5     6     7
...
    green => [ 0b00, 0b00, 0b10*,  0b01, 0b00,  0b00, 0b00, 0b00, ],
    blue =>  [ 0b00, 0b00, 0b00,   0b10, 0b01*, 0b00, 0b00, 0b00, ],
};

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```
0b01 & 0b10 & 0b01 == 00 ==> No hits.
```