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First, separate the cats do not know the cat that I know.
Cats do not know to remember, it will appear on the exam.
Know cats will not appear on the exam.

Forget is little question before, repeated memory, and to fix the memory.
Or achievement rate is to be stored all and to 100 percent,
Achievement rate will decrease because you forget the time has elapsed.
If you answer "know" to the first question will not be three months questions.
If you answer "do not know" to the first issue will appear on the exam after a few minutes.
If you answer "know" to the problem it will appear on the exam after one hour.
And, If you answer "know" to the problem it will appear on the exam after 24 hours.
And, If you answer "know" to the problem it will appear on the exam after two days.
And, it will appear on the exam in four days after If you answer "know" to the problem.
And, it is question to the answer and 6 days after the "know" to the problem.
And, it is question to the answer and 8 days after the "know" to the problem.
And, it is question and answer "know" on the issue after 10 days.
And, it is question to the answer and 15 days after the "know" to the problem.
And, If you answer "know" to the problem it will appear on the exam after one month.
And, it is question and answer "know" to the problem after three months.
The middle is the answer and also from the beginning "do not know".
.....
And it is imperceptibly fixed in memory.