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#!/usr/bin/env perl

...

    print "$_\n" unless $no_print;
}

thew
trow
thew
trow

dd \%master_letter_freq;      # <-- QUERY
dd \@result;                  # <-- QUERY
...
            $seen{$_}++ for (split //,lc $_);
            dd \%seen;        # <-- QUERY
            # ... and so on ...

./script.pl | cat -vet