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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.
The tests for this kata contain invalid roman numerals with MMMM, I have created a correct validator and it fails the tests because the tests include invalid numerals expected to pass (ex: 'MMMMCCCXXXII', 'MMMMCXII').
You can check the validity on other external sources to see they are incorrect.
Please correct your tests or don't call the kata "valid romans".