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Nov 13, 2020 at 13:56 comment added Vilx- Cheryl's Birthday was the first thing that came to my mind when I read the question! It's such an implicit assumption - that Cheryl has only one birthday - that it's sooooo easy to miss it. But the puzzle cannot be solved without it.
Nov 12, 2020 at 2:21 history answered Graylocke CC BY-SA 4.0