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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.
Fixed. Now the tests expect you to throw an error, as per description.
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Did you check what is expected by sample tests? In sample tests you can see that the answer should be an appropriatelly formatted string. Parentheses, nubmers and commas are parts of the string.