What is needed to teach X

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1) One must understand X.

2) One must understand why it is difficult for the student to understand X.

3) One must understand The correct next step to take in removing the difficulty in 2).

And that is pretty much it. If you don't have 1 to 3 down, years of studying "education" won't help much. And if you do have 1 to 3 down, then those years of study will mostly be icing on the cake.

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