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I want to look for duplicate blocks of text within the same document. Tools like WinMerge and Beyond Compare don't seem to do this.

Does anyone know of a utility that can do this?

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up vote 3 down vote accepted

Simian does what you are looking for. It even allows you to define thresholds to catch smaller and smaller identical pieces of text. It isn't Open Source, but the license allows it be used free for evaluation and non-commercial use.

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