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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.
i don't understand the the question, can you simplified to me plz
Your code is returning an array of strings and it should return an array of arrays, where the two values in the inner arrays are a string and a number.