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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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This Kata is good for improving the fundamentals of a language especially how precedence and operators. The question is a no-thinker, direct application of formula is all it takes.