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Any learning method can be effective as dry cloths absorb water.
However, once the water is completely exhausted, any method cannot be effective.
While extensive reading is effective, you should continue it. If it is effective by reading aloud
Keep reading aloud.
But for the effect
"If you don't keep doing it for 3 years, you won't know the effect."
It is sometimes said. There is actually such a method, but in my own experience I think
that it would be better to give up and look for another method if it does not work after 3 days.
However, depending on the way of thinking, even if you try hard for 3 years, you may continue
to work hard even if there is almost no effect.