public NGramFrequencyMap extractFreqs(Text annotations) {
    String text;

    if (removeStopWords) {
      List<Sentence> noStopwordsText = removeStopwords(annotations);
      text = "";
      for (Sentence sent : noStopwordsText) {
        text = text + " " + sent.getConcatTokens();
      }
      text = text.trim();
    } else text = annotations.toString();

    return extractFreqs(text);
  }