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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.
You're free to skip it, it's a puzzle, if you don't like them...
It's very annoying to put us on the wrong track with those sample tests. Skipping this one.
Your code has problem with repeated numbers, the random tests show the input value, look carefully at what your code does when it fails.