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#!/usr/bin/perl
use warnings;
use strict;
...
print"\n All possible combinations of 2-letter words: ???$combi_2l\n";
print"\n All possible combinations of 3-letter words: ???$combi_3l\n";
exit;

All possible combinations of 2-letter words (16):
AA
AT
...
CT
CG
CC

All possible combinations of 3-letter words:
AAA
...
...
...
CCC