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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.
given the test cases set up, the wording of the problem and the example given is way too vague to clearly understand unless one already has done a similar kata.