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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.
The kata is wrong. In Instruction is stated "if n==0, then return an empty array", but your basic test requires it to be an array with one element: number zero. This is very frustrating, please corret the test.