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It is the only way in, and that is deliberate. GitHub is where code lives and where your work will live. You will need an account before you write anything anyone else sees, so you may as well have it now.
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We store the code you submit, so the exercises can be improved, along with your progress. If you buy, we keep a record of the purchase. Nothing is sold and nothing goes to advertisers.
The whole list, and how long any of it is kept