code: public String[] lemmatize(final String[] tokens, final String[] postags) {
      final List<String> lemmas = new ArrayList<String>();
      for (int i = 0; i < tokens.length; i++) {
        lemmas.add(this.apply(tokens[i], postags[i]));
      }
      return lemmas.toArray(new String[lemmas.size()]);
    }
docs: /*
  (non-Javadoc)
  
  @see eus.ixa.ixa.pipe.lemma.Lemmatizer#lemmatize(java.lang.String[],
  java.lang.String[])