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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.
See the input for those tests, they're negative numbers, your code is failing with them.
Is there an issue with the Swift version? It's not allowing me to use flatMap, and I'm compiling with Swift 3.1.1.