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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.
Ruby 3.0 should be enabled, see this to learn how to do it
poor description and limited sample tests in my opinion. No mention of weather the test cases include negative value or no stings at all.