SudokuPrimer 48 - pseudo-quiz - why does that number go there?
SudokuPrimer 49 - pseudo-quiz - why does that number go there?
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SudokuPrimer 50 - pseudo-quiz - why does that number go there?
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SudokuPrimer 61 - pop-quiz on an easy puzzle
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SudokuPrimer 51 - pop-quiz with an easy puzzle - see why each number is placed where it is
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