docs: public TreeReaderFactory treeReaderFactory() {
      return new TreeReaderFactory() {
        public TreeReader newTreeReader(Reader in) {
          return new PennTreeReader(in, new LabeledScoredTreeFactory(), new NPTmpRetainingTreeNormalizer(englishTrain.splitTMP, englishTrain.splitSGapped == 5, englishTrain.leaveItAll, englishTrain.splitNPADV >= 1, headFinder()));
        }
      };
    }