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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.
Because your code is wrong. Read the description of the Kata again.
Can you please explain in more detail what you're asking?
why they return the answer wrong?????