Killer Sudoku, Difficulty 7

Puzzle 535 Jun 25 June 2009
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Difficulty 7/10 Average solving time 52 min
Puzzle 537 Jun 26 June 2009
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Difficulty 7/10 Average solving time 53 min
Puzzle 559 Jul 3 July 2009
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Difficulty 7/10 Average solving time 44 min
Puzzle 565 Jul 5 July 2009
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Difficulty 7/10 Average solving time 45 min
Puzzle 568 Jul 6 July 2009
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Difficulty 7/10 Average solving time 52 min
Puzzle 595 Jul 15 July 2009
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Difficulty 7/10 Average solving time 40 min
Puzzle 610 Jul 20 July 2009
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Difficulty 7/10 Average solving time 38 min
Puzzle 619 Jul 23 July 2009
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Difficulty 7/10 Average solving time 50 min
Puzzle 631 Jul 27 July 2009
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Difficulty 7/10 Average solving time 40 min
Puzzle 640 Jul 30 July 2009
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Difficulty 7/10 Average solving time 46 min
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