/gag/a9KDDKK

  public static void main(String[] args) {
    final int LETTERS_IN_ALPHABET = 24;

    for (int i = 0; i < LETTERS_IN_ALPHABET; i++) {
      final int round = i;

      final String shifted = generateCode().stream()
          .mapToInt(e -> (e + round) % LETTERS_IN_ALPHABET)   // apply Ceasar cipher
          .map(e -> e + 'a')                                  // shift into ASCII alphabet range
          .mapToObj(e -> String.valueOf((char) e))            // convert ASCII code to character
          .collect(Collectors.joining());

      System.out.printf("%2d: %s\n", i, shifted);
    }
  }

  private static List<Integer> generateCode() {
    int i = 0;
    int t = 18;

    final List<Integer> code = new LinkedList<>();

    for (t=t; t>0; t--) {
      i++;
    }
    code.add(i);

    for (t=t; t<13; t++) {
      i--;
    }
    code.add(i);

    for (t=t; t>9; t--) {
      i++;
    }
    code.add(i);
    code.add(i);

    for (t=t; t>6; t--) {
      i++;
    }
    code.add(i);

    for (t=t; t>-7; t--) {
      i++;
    }
    code.add(i);

    return code;
  }