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list of letters or pattern: :otrwreh
master_letter_freq:
...
thew
trow
list of letters or pattern:

list of letters or pattern: :otrwreh
list of letters or pattern: ---w
...
trow
whew  ## this is the problem!! "w" is not allowed to repeat!
list of letters or pattern: exit

RESULT: foreach (@result)
        {
...
        
            print "$_\n";
        }

foreach (@result)
{
...

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