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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.
I disagree because it's a problem that is easily solved recursively, which is good for practicing recursion.
I think this is a bad kata because it has nothing to do with programming skills. All you need to know is the right mathematic formula.
wtf