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Review

Every question you miss comes back: tomorrow, then after 3 and 7 more days, then 21. Get it right and it moves up the ladder; miss it and it starts again. Below that is your mistake log, grouped by what went wrong.

miss→+1→+3→+7→+21 days\text{miss} \to +1 \to +3 \to +7 \to +21 \ \text{days}