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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 think the values used to perform each of the test cases should have been added so that you would at least know why your code didn't pass a particular testcase.
Love your solution!