In my study system, once you get to “A” then “B” then “C” and so on, each time the flashcard moves forward it moves by half as many days forward. For example, at “D” level, I would next see a flashcard 193 days later. Half of 193 is 97 (rounded up). 193 + 97 = 290. So, at “E” level, I would next see a flashcard 290 (actually I made it 291) days
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