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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.
Good comment. I've tried to do the same solution, but then, like, wait a minute...what if the test will be not 27 or 153, what if
the number will be very huge, like 325352952095239525. It will be not optimal solution and take much more time.