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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.
Which language?
I think that a better solution would be to add some more tests that would fail if you changed to text of the identifiers. Right now its more like guessing what output is wanted for the final submission.