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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.
In the basic tests, 431 is included as one of the possible special primes, even though it does not meet the condition of its digit sum being a perfect square.