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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 test cases appear to be both wrong and inconsistant. This is true if you use the array's natural index as well if you use a counter and skip spaces.
Really just a poorly designed test.