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Given an arbitrary string, what is an efficient method of finding duplicate phrases? We can say that phrases must be longer than a certain length to be included.
Ideally, you would end up with the number of occurrences for each phrase.
Like the earlier folks mention that suffix tree is the best tool for the job. My favorite site for suffix trees is http://www.allisons.org/ll/AlgDS/Tree/Suffix/. It enumerates all the nifty uses of suffix trees on one page and has a test
jsapplicaton embedded to test strings and work through examples.