Revision history of "Penguin lineups"

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  • (cur | prev) 16:39, 10 November 2014Oscarlevin (talk | contribs). . (600 bytes) (+600). . (Created page with "Here is a counting problem based on Gilbreath permutations. ==Puzzle== You have 10 penguins, each a different height. You want to take a photo of the penguins in a single s...")