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You’ve come across a number-operated locking system. Answer this question to unlock your handcuffs. What comes next: 3, 6, 9, 12, ______ .

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Interesting fact:

Norway has an island prison which houses the worst criminals who end up spending years there. Oddly enough, the majority of the prison is completely open, which allows prisoners to do whatever they want. Most never become repeat offenders after leaving the prison.