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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.
Is this not considered kind of cheap though by using hardcoded entries for multi-symbol values like IV, IX, XL, etc.? I thought that the "proper" solution would only use what was shown in the challenge prompt as hardcoded symbol/value pairs.