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The man dubbed the "father of Sudoku" for his role in popularising the numerical brainteaser loved by millions, has died of cancer at 69.
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The man dubbed the "father of Sudoku" for his role in popularising the numerical brainteaser loved by millions, has died of cancer at 69.
Prime Minister Lee Hsien Loong, who graduated from Cambridge University with a mathematics degree and computer science diploma, first revealed the existence of the...