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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.
Yes, what you're missing is the whole function could be replaced by
And pass the test. You should add random tests and maybe leave the Jim test in the Sample tests so people see how it works.