docs: public TreeReader newTreeReader(Reader in) {
      if (discardFrags) {
        return new FragDiscardingPennTreeReader(in, new LabeledScoredTreeFactory(), tn, new CHTBTokenizer(in));
      } else {
        return new PennTreeReader(in, new LabeledScoredTreeFactory(), tn, new CHTBTokenizer(in));
      }
    }