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Get a list of the names of the available stemming algorithms.
Note that there are also aliases for these algorithm names, which are not
included in this list by default. If the 'aliases' keyword parameter is
False, this list is guaranteed to contain precisely one entry for each
available stemming algorithm. Otherwise, all known aliases for algorithms
will be included in the list.
Note that the the classic Porter stemming algorithm for English is
available by default: although this has been superceded by an improved
algorithm, the original algorithm may be of interest to information
retrieval researchers wishing to reproduce results of earlier
experiments. Most users will want to use the "english" algorithm,
instead of the "porter" algorithm.
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