freebsd-ports/textproc/py-snowballstemmer/pkg-descr

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Snowball is a small string processing language for creating stemming algorithms
for use in Information Retrieval, plus a collection of stemming algorithms
implemented using it.
Stemming maps different forms of the same word to a common "stem" - for example,
the English stemmer maps connection, connections, connective, connected, and
connecting to connect. So a searching for connected would also find documents
which only have the other forms.