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 The display shows a sequence of digits that you have to memorize and repeat.
 Every digit can appear only once in the number.
 You start with a sequence of two digits. The longest possible sequence is a sequence of ten digits.
 When you repeat the sequence of digits correctly twice in a row, the sequence is extended by one digit.
 If you repeat the sequence incorrectly twice in a row, the game is over.
 If a green light comes on next to display, it means that you will advance to the next level if you answer correctly. If a red light comes on next to display, it means that the game will be over if the answer is incorrect.
 Every day your best result of the day is saved. Track progress.