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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.
When I try to test my code, it shows that "421 should equal 441". I ran my code in different IDLEs and it worked. I don't understand why it is not working in this kata. (Python)