https://opennlp.apache.org/docs/2.5.4/apidocs/opennlp-tools/opennlp/tools/stemmer/snowball/porterStemmer.html
porterStemmer (Apache OpenNLP Tools 2.5.4 API)
declaration: package: opennlp.tools.stemmer.snowball, class: porterStemmer
apache opennlptoolsapi