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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.
Let's just say I don't think it only takes good coding skills to solve it in a nice way ;)
[And this gets me the 100th comment!]
Great kata!!! I think it is more likely a mathematical problem.