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A sample 4 × 4 Sudoku puzzle with enumerated candidate sets. Circle... | Download Scientific Diagram
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logical deduction - A Sudoku with only four given digits and some more rules - Puzzling Stack Exchange
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Sudoku for Kids 4x4 Puzzles Easy and Hard: 400 Sudoku Puzzles with Solution : First Sudoku for Kids : Maia Harvey: Amazon.in: Books
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