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Mom and Sudoku

My mom has a thing for sudoku, she is always solving a few each day and is very fast at it too. I can't ever match her speed, and she is 60! Recently, she has moved on to "Extreme Sudoku" with difficulty rating of 5 and above, and I still take 5 to 10 minutes for the easy ones. I am so proud of her, but (sigh!), I better catch up!

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