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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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well, most of times we call some functions without knowing how it's done inside the blackbox, that is abstraction. it is a fact that is not readable but you would not need to read that.
It's not the author who sets the Kyu. It seems a 7 Kyu kata to me and that's the average of voted rank.
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Are you sure
Math.rounddoes what you want?