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Syntax: Space-separated list of suffixes
When using the Word Forms Custom, this is the space-separated
list of suffixes to use. All of these will be repeatedly stripped
off of words, as long as the word is longer than the
Custom Suffix Min Length.
An example setting could be s es ' a e i y. For the word
smith's, the sand ' would be stripped, causing it to
match smith, smiths, etc.