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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.
Python - I think one of the randome test still have the actual and expected value mixed up in the assert. There is always one random test that says my expected value is incorrect, so I run my code in an ide with the failed input and it returns the proper value.