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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.
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Steve doesn't have 4 birthdays falling in weekends.
(By the way : did you put the spoiler flag on your question yourself ?)
Steve have 4 birthdays falling in weekends, but Dave only 3. Why Dave is correct answer here?
("Steve", "2010-11-18"), ("Dave", "2010-11-22")], "2022-12-31") => "Dave"