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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.
that just means that there are some cases when your code is incorrect (the full test suite has more tests than just the sample tests).
EDIT: mm, I thought about another kata. But that still applies: some combinations appear only with bigger inputs than the ones in the sample tests. So your solution is incomplete.