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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.
Could you elaborate on what the lambda function does in your solution exactly?
Your conditions don't change with each call, its like having while True in your code. That's why you end up getting an error.