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what is sudoku
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What Is Sudoku?

Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each

who was rube goldberg
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Who Was Rube Goldberg?

Who Was Rube Goldberg? Reuben Lucius “Rube” Goldberg was born on July 4, 1883, in San Francisco, California. As a teen, he loved to draw a