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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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You're iterating over the entire set twice? What if there are a million elements, and it starts
{ odd, odd, even }? This is neither clever nor best practice.