in reply to Perl sorting unique values
There is the perldoc tool installed with your Perl, and also the perlfaq online. Searching for your keywords yields good explanations of how to do things:
> perldoc -q uniqueHow can I get the unique keys from two hashes?
How can I remove duplicate elements from a list or array?
> perldoc -q sort
How do I sort an array by (anything)?
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Seekers of Perl Wisdom