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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.
Something like random tests should be added to prevent hardcoding. But that doesn't really matter because there's a lot of katas about primes and about palindromes now, combining the two ideas doesn't really add anything new.