docs: public void printAnswers(List<CoreLabel> doc, PrintWriter out) {
      for (CoreLabel wi : doc) {
        String answer = wi.get(AnswerAnnotation.class);
        String goldAnswer = wi.get(GoldAnswerAnnotation.class);
        out.println(wi.word() + "\t" + goldAnswer + "\t" + answer);
      }
      out.println();
    }