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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.
Yes, you can only return 5 numbers from the input array.
"returns an array of 5 of those numbers"
This means that the array has to be a subset of the original array? The only numbers you can return are 5 from the input array?