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I need help reading book titles from an existing file and printing ONLY its duplicates to a new file. CANNOT use Set or Map. I

I need help reading book titles from an existing file and printing ONLY its duplicates to a new file. CANNOT use Set or Map. I already have a way to read the current file using BufferedReader/FileReader. I just need a way to print the duplicates from a file to a new output file. Java please. Thank you in advance!

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Advances In Databases And Information Systems Second East European Symposium Adbis 98 Poznan Poland September 1998 Proceedings Lncs 1475

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