scheduled import of Lingua::Stem 0.84.
This is a rather incomplete implementation of work done by Gudrun
Putze-Meier. I have to confess that I never read her original paper. So
all credit belongs to her, all bugs are mine. I tried to get some insight
from an implementation of two students of mine. They remain anonymous
because their work was the wost piece of code I ever saw. My code behaves
mostly as their implementation did except it is about 75 times faster.
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