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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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you have to write your own tests, there is a reason why you have to write your own tests. Read the question carefully.
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I enjoyed it, nice to see others solutions employing different tactics to pass the tests.