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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.
I see some kata have extra tests on submission, including randomly generated test cases.
I couldn't find a difference between "Test Cases" and "Sample Test Cases" for the exisiting languages in this kata, and the advice is not to be original.