This program reads each successive line in a text file as a separate entry (assuming it's not a blank line), and determines if that entry has occurred previously in the text file (in other words, is the current entry a duplicate?) The program has the ability to permit the user to write a new text file containing only the unique items from the original text file, while omitting duplicates. The program is case-sensitive, so "PINEAPPLES" isn't the same entry as "pineapples", nor as "Pineapples".
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