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1. a b B c A C <- bad
2. a b B A c C <- ok
...
4. a b A B c C <- bad
5. a b B c C A d e E D <- ok
6. a A b B c C <- ok

 %k = ( 0 => 8,
        3 => 5,
...
        66 => 76,
        67 => 74);