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Porter Stemming Algorithm
This is the Porter stemming algorithm, ported to Python from the
version coded up in ANSI C by the author. It may be be regarded
as canonical, in that it follows the algorithm presented in

Porter, 1980, An algorithm for suffix stripping, Program, Vol. 14,
no. 3, pp 130-137,

only differing from it at the points maked --DEPARTURE-- below.

src/t/w/twitter_bot-HEAD/preprocessing.py   twitter_bot(Download)
    return [WORD_DELIMITER.join(words[i:i+n]) for i in range(len(words)-n)]    
import PorterStemmer    
stemmer = PorterStemmer.PorterStemmer()