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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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It's a really nice kata but I'd disable the Hash class for it. Using a hash isn't really a point of this kata – there are far better ways (see the author's solution).
Rather impressive. Took me a couple minutes to understand how it works :) Really smart solution.