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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.
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Yes, you're correct. At the time of writing this Kata I did not read the problem carefully enough - a nasty habit of mine. I can't edit this solution, and haven't the need for re-practicing this Kata. I guess this Kata and your, and my comments can be a learning experience for other's.