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I was reading a paper that I found via spiked math (http://spikedmath.com/comics/424-the-numbers-quiz-solutions.png): http://www.afjarvis.staff.shef.ac.uk/sudoku/sudoku.pdf.

I have problem understanding the subsection Refined permutation and relabelling. Can someone please help?

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    It would help if you say what you don't understand. The rearrangement strategy is used before in the paper, trying to reduce the number of configurations that need to be counted.2011-06-24
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    I can't see where the "2051 possible B2/B3 pairs" comes from.2011-06-25

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