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use strict;
use warnings;
...


__END__

[ABC][DEF][HIJ] => ABC DEF HIJ
ABC[DEF]HI[JK][LMNO]PQ => A B C DEF H I JK LMNO P Q
...
[ABCDEFHIJKLMNOPQ] => ABCDEFHIJKLMNOPQ
ABCDEF => A B C D E F
 =>