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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.
The C# translator has deliberately added a lot of random tests to the actual "Test Cases" to test for the performance of your solution. Try to come up with a more efficient approach ;)