private int commonSubsequenceLengthForward(int oldIndex, int newIndex, int maxLength) {
    int x = oldIndex;
    int y = newIndex;

    maxLength = Math.min(maxLength, Math.min(myCount1 - oldIndex, myCount2 - newIndex));
    while (x - oldIndex < maxLength && myFirst[myStart1 + x] == mySecond[myStart2 + y]) {
      ++x;
      ++y;
    }
    return x - oldIndex;
  }
private int commonSubsequenceLengthForward(int oldIndex, int newIndex, int maxLength)