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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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Agree with positive comments here, this is a good challenging problem, and while I experienced some frustration along the way, I was always eager to keep the hunt alive. Its super satifsying to compare the final solution's performance with the back of the envelope estimate at how long my first naive solution would have performed. Kudos to Voile for creating the kata!