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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 should raise an Exception instead of returning false for invalid inputs.
Please, try to properly format code when posting, with a triple backtick before and after it.
That said, your code does not pass because it is extremely inefficient for this task and there is at least a better way to get the result :)