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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.
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You can use the timeit module to do so.
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The problem is from your code. The message is explicit about what you do, it even gives you the line where the problem occurs. This can help: https://docs.codewars.com/training/troubleshooting/