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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.
Nowhere, but that requirement was added recently and wasn't there when this solution passed.
Where does this throw the error?
Starting odd, and then incrementing by 2 to only iterate on odd numbers, is something I briefly considered. Nice.