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Logical Thinking Puzzles: 4×4 Sudoku | Teaching London Computing: A RESOURCE HUB from CAS LONDON & CS4FN
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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 1 to 4 (easy) - Wet Break/Holiday Activities Maths Worksheets for Further Resources by URBrainy.com
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