Daily drill
Short sessions until the letters are automatic. Cards come back on the clock — an hour, four hours, eight, then a day — so morning, afternoon and evening each have something ripe. A letter you had to think about does not count as known.
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Rebuild schedule brings every card you have met back to today and caps spacing at one day. Use it if a heavy drilling session pushed everything weeks out — it keeps what you have seen and drops the false confidence.