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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.
You don't want to check if the string contains the letter 'r', but rather if it starts with the letter 'r'
This was a fun kata. I originally thought it would be easy (classic), but I then found myself stretching to complete the kata. Well built!