code: package helpers;
  
  public class Test_CoreNLPFeaturizer {
  
      public static void main(String[] args){
  
          String doc =    "what O\n" +
                          "flights O\n" +
                          "leave O\n" +
                          "Atlanta B-LOC\n" +
                          "at O\n" +
                          "About O\n" +
                          "Digit O\n" +
                          "in O\n" +
                          "the O\n" +
                          "Afternoon O\n" +
                          "and O\n" +
                          "arrive O\n" +
                          "in O\n" +
                          "San B-LOC\n" +
                          "Francisco I-LOC\n" +
                          ". O\n" +
                          "\n" +
                          "what O\n" +
                          "is O\n" +
                          "the O\n" +
                          "abbreviation O\n" +
                          "for O\n" +
                          "Canadian O\n" +
                          "Airlines O\n" +
                          "International O\n" +
                          ". O";
  
          CoreNLPFeaturizer cf = new CoreNLPFeaturizer();
  
          String features_tsv = cf.featurizer.extractFeatures(doc, "conll");
  
          System.out.println(features_tsv);
      }
  }
  