It is expected to consist of 6 numbers. Side by side, a maximum of 2 consecutive numbers can be found. It's possible to use the same number up to 2 times in a row. It is possible to repeat 2 digits side by side a maximum of 2 times. At least 3 different numbers must be used in it. It shouldn't be the same for the first 3 digits and the last 3 digits.