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Cliff Pickover on Twitter: "This puzzle is called "Pi Sudoku." https://t.co/NKykUH0nvR https://t.co/jC0iC4jp3Y" / Twitter
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mathgrrl on Twitter: "New and improved Super Pi Day puzzle! Can you solve it before the pi clock counts down to 3/14/15 9:26pm? http://t.co/crczucN6rN" / Twitter
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