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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.
The description still doesn't describe the actual task.
What do the mathy shenanigans mean?
also,
sum_not_prime
becamesum_prime
whithout any additional explanation: this smells absolutely bad for the quality of the description.