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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.
You're reading it wrong. But it was not described as clearly as possible.
You have to read the operation first, then the array, which is the resultant array from that operation.