Learn by doing again, again and again...
A kata is meant to be memorized. Students of a kata study it as a form, not as a conclusion. It is not the conclusion of the kata that matters, it's the steps that lead to the conclusion.
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Build a Class to calculate the score of a bowling game.
Really helpful resource to learn the kata and deconstruct the steps to create the Class http://butunclebob.com/ArticleS.UncleBob.TheBowlingGameKata