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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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no details, closing
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I think it depends on how you solve it, but in the general case this feels 6kyu-ish to me as well.
Please post the tests(on which you think there is an issue) here.