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One of 2 algorithms by Martin Porter for stemming, i.e.: reducing English words (as well as practical) to their roots, for purposes of improving information retrieval.

It does some fairly computationally cheap manipulation to return a "stem" word for most (English) words, e.g.: "biologically" matches "biologist."

He has a Web page for his better-established algorithm:


It has numerous links to implementations in various programming languages.

By his own comparison with LovinsStemming, he traded a shorter reach (i.e.: fewer characters) to his matching and transformation rules, for dramatically more (conceptual) steps in the algorithm.

He has a separate Web page for his newer algorithm:


It has links to implementations in far fewer languages.


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