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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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The instructions were a doozy! To help clarify: The rand() method's expected output is an integer (as opposed to an array/sequence), and the goal is to have rand() not produce the same integer twice until all numbers in range 0-n have been produced.