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Kneeling to open a locked lock with the clock ticking overhead, you feel a momentary flash of doubt. Turn left first? What's the middle number? Instinct takes over (left 28 right 4 left 16) and suddenly it snaps open, but you're not 100% sure you can do it again next time. Combination locks have 60,000 possible combinations, so you will miss class trying to guess it. Maybe you should write it down.