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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.
This means you returned 10 and should have returned 1:
Expected your answer to equal the correct answer
It means the opposite: You returned 10, it expected 1.
Tests never expect 10. You must misinterpret something.
It's amazing to see such constructive criticism.