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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.
That's the question I got from a company's coding assessment, I agree, there is some information doesn't clarified, and I try what you said in my code and try that test again , but stll left 3 test cases couldn't pass, unfortunately, all the weighted test cases are hiden.