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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.
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Read the test code: it explicitly wants you to mark -2 as prime. Bug in the author's head, sadly. :(
I'm kind of bummed to see so many double-reverse answers marked as "best practices." Good to see one solution that's effectively the same as mine, tho. :)
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