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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 question should be reworded because assuming the list of names has a length of 5 is silly and unnecessary.
However, the big number requirement is perfectly reasonable, and is stated in the original problem. The whole point of this kata is being able to overcome that challenge.