allExtractors,
new Preceding(3),
new Following(3)));
// this.parseFeatureExtractors = new ArrayList<ParseSpanFeatureExtractor>();
// this.parseFeatureExtractors.add(new ParseSpanFeatureExtractor());
parseExtractor = new ParseSpanFeatureExtractor();
//initialize feature selection
if (featureSelectionThreshold == 1) {
this.featureSelection = null;
} else {