Remove repeated characters from a string - http://www.perlmonks.org/?node_id=353072

How to find and remove duplicate elements from an array? - http://www.perlmonks.org/?node_id=90493

perlfaqs - http://perldoc.perl.org/perlfaq4.html

perl references - http://www.sdsc.edu/~moreland/courses/I ... rlref.html

perl tuts - http://perldoc.perl.org/index-tutorials.html

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