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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.
And isn't that what you should do to solve the kata? It seems you're misunderstanding something.
Not all possible combinations can be checked, have you a solution that fails only that test and passes the current ones?