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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 way you currenlty have it, it's returning an array of string numbers. You need to do something to convert each array value to a number then you should pass it fine.