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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.
A little unclear in terms of errors - for an ideally somewhat basic/introductory kata, the concept of dealing with integers (e.g. 15) vs. floats (e.g. 15.0) is a bit rough. All in all, though, solid kata - and one of the more enjoyable ones I've seen!