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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.
Legitimately the best solution I've seen. Not sure why so many others w/ deficient algorithms that won't work for very high numbers are at the top.
Nice job -- works w/ extremely high numbers, unlike many of the other solutions posted.