English Porter2 stemmer implementation
Search for the longest among the following suffixes, and, if found and in R2, delete if preceded by s or t
Search for the longest among the following suffixes, and perform the action indicated.
Search for the the following suffixes, and, if found, perform the action indicated. e delete if in R2, or in R1 and not preceded by a short syllable l delete if in R2 and preceded by l
Search for the longest among the suffixes,
Define a valid li-ending as one of c d e g h k m n r t