docs: private CoreLabel makeCoreLabel(String line) {
      CoreLabel wi = new CoreLabel();
      // wi.line = line;
      String[] bits = line.split("\\s+");
      switch (bits.length) {
      case 0:
      case 1:
        wi.setWord(BOUNDARY);
        wi.set(AnswerAnnotation.class, OTHER);
        break;
      case 2:
        wi.setWord(bits[0]);
        wi.set(AnswerAnnotation.class, bits[1]);
        break;
      case 3:
        wi.setWord(bits[0]);
        wi.setTag(bits[1]);
        wi.set(AnswerAnnotation.class, bits[2]);
        break;
      case 4:
        wi.setWord(bits[0]);
        wi.setTag(bits[1]);
        wi.set(ChunkAnnotation.class, bits[2]);
        wi.set(AnswerAnnotation.class, bits[3]);
        break;
      case 5:
        if (flags.useLemmaAsWord) {
          wi.setWord(bits[1]);
        } else {
          wi.setWord(bits[0]);
          }
        wi.set(LemmaAnnotation.class, bits[1]);
        wi.setTag(bits[2]);
        wi.set(ChunkAnnotation.class, bits[3]);
        wi.set(AnswerAnnotation.class, bits[4]);
        break;
      default:
        throw new RuntimeIOException("Unexpected input (many fields): " + line);
      }
      wi.set(OriginalAnswerAnnotation.class, wi.get(AnswerAnnotation.class));
      return wi;
    }