When I was thinking of writing a sudoku solver, I thought of treating the numbers as FS vaiables instead ofnstead of treating the positions as FD variables Rows, columns and blocks are (fixed) sets of positions as well. Then you just need to say the numbers are all mutually disjoint, have cardinality 9, and have a singleton intersection with each row, column and block. I though this would be nicer to code than the FD approach. Any thoughts on the relative merits of the approaches?
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