Old college friends of mine, and their growing families, meet annually at a beautiful old country house in Britain and, although I can't join with them often these days, they always think of me and send me photos of them having fun. This year they sent me a little puzzle - they had lined up for photos in three different groupings and challenged me to guess the reason behind each order. The first two are fairly easy, but I struggled with the third. For guesses and the answer click on "Comments" above.
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