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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.
Elegant and simple!
The test cases could be improved by reporting more than just "Value is not what was expected". Reporting the input value and expected output value would be helpful.