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This module applies the Porter Stemming Algorithm to its parameters,
returning the stemmed words.
The algorithm is implemented exactly (I hope :-) as described in:
http://snowball.tartarus.org/algorithms/italian/stemmer.html
The code is carefully crafted to work in conjunction with the
Lingua::Stem module by Benjamin Franz, from which I've also borrowed
some functionalities (caching and exception list).
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