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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.
Defined sample test cases and added random tests.
Looks like sample tests are not defined. I'll add them soon.
By the way, you can add your own test cases there while writing the solution. That's the original purpose of sample tests.