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The duplication detector is a tool used to compare any two web pages to identify text which has been copied from one to the other. It can compare two Wikipedia pages to one another, two versions of a Wikipedia page to one another, a Wikipedia page (current or old revision) to an external page, or two external pages to one another. Duplication detector locates passages in which the text on the two pages is the same. The number of words to match is variable, but set by default to 2.