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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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Passing all the sample tests, then failing one of the random 200 tests. The description and parameters aren't clear enough to figure out what's causing the failed test, and there's no way to view the failed test on Codewars (like you can on other platforms).