code: public static WordTag stemStatic(String word, String tag) {
      initStaticLexer();
      return new WordTag(lemmatize(word, tag, staticLexer, staticLexer.option(1)), tag);
    }
docs: Return a new WordTag which has the lemma as the value of word().
  The default is to lowercase non-proper-nouns, unless options have
  been set.