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How to use this site .

At the beginning of every lesson we have a prerequisite section. The objective is set at the top and then the most complicated required level of knowledge is below it. Every line under that shows you the foundation knowledge required to complete the step above it.

Each one of these prerequisites links you out to a variety of lessons you can do, or tutors and schools you can contact so that you understand each level.

Choose the level you understand and then work upwards from there to the goal at the top.

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