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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.
Looks like there is still an issue with the second test case as TwnET pointed out. It is expecting 8 and 13 to NOT be prime numbers. 13 is a prime number.