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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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Nice kata. Will you add the katakana alphabet into the test suite? That's what made me rethink the whole thing in the previous kata.
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Interesting one, but try adding more test cases with large numbers as the only one that is currently in place could be hard-coded.