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use warnings;
use strict;
...
[a]c - c d e f g h i j k l m n o p q r s t u v w x y z a b
[a]b - b c d e f g h i j k l m n o p q r s t u v w x y z a
[a]a - a b c d e f g h i j k l m n o p q r s t u v w x y z