/**
   * Applies smoothing and compares two sentences
   *
   * @param sentence1 Sentence 1
   * @param sentence2 Sentence 2
   * @param operation Type of smoothing to apply
   * @param smoothing Object of class {@link Smoothing}
   */
  private void compareSentence(
      final String sentence1,
      final String sentence2,
      final Models operation,
      final Smoothing smoothing) {
    // Do smoothing for each sentence
    System.out.println(operation);
    final double comp1 = smoothing.doSmoothing(sentence1, operation);
    System.out.println("Sentence 1 Probability: " + comp1);

    final double comp2 = smoothing.doSmoothing(sentence2, operation);
    System.out.println("Sentence 2 Probability: " + comp2);

    // Compute result
    String output = "";
    if (comp1 > comp2) {
      output = "S1 is more probable";
    } else if (comp1 < comp2) {
      output = "S2 is more probable";
    } else {
      output = "S1 and S2 are equally probable";
    }

    System.out.println(output + "\n");
  }
 /**
  * Display probability table for sentences
  *
  * @param sentence1 Sentence 1
  * @param sentence2 Sentence 2
  * @param smoothing Object of class {@link Smoothing}
  * @param smoothingType Type of smoothing
  */
 private void displayTable(
     final String sentence1,
     final String sentence2,
     final Smoothing smoothing,
     final Models smoothingType) {
   System.out.println("\nS1: " + sentence1 + "\n");
   smoothing.displayProbabilityTable(sentence1, smoothingType);
   System.out.println("\nS2: " + sentence2 + "\n");
   smoothing.displayProbabilityTable(sentence2, smoothingType);
   System.out.println();
 }