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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.
C#: actual and expected are swapped.
Ruby 3.0 should be enabled.
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This question needs to be revised with more details and tons more test cases. I believe the author wants an actual use of closure, but the answer can be provided without the use of a closure.
Instructions are very unclear as to what is expected in this Kata.