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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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I could be totally wrong here, I'm a bit of a newb, but is this really deserving of all the best practice votes? Creating 2 separate methods for what could easily be done with a couple for loops inside of findEvenIndex() just feels overly complicated.
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