Created
May 28, 2014 20:40
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| itemsInSquare :: Sudoku -> Position -> [Digit] | |
| itemsInSquare (Sudoku rows) (Position x y) = [y'..y'+2] >>= (\idx -> take 3 $ drop x' $ rows !! idx) | |
| where x' = x - x `mod` 3 | |
| y' = y - y `mod` 3 |
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