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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.
This is really good.
This is a really smart solution, it takes advantage of the fact that the smallest factor of a number must be prime.
This is definitely the best way to do it, this is a regular expression problem.