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Task 1 (a). Explain how you may be able to determine where to put the digit x in row r by inspecting the values of the counts for the row r before and after we discount the digit x.

Task 1 (b). Describe how recording hidden information in the model, such as a certain cell cannot contain a particular digit, might help the solving of a puzzle.

Task 2. Answer to Exercise 2.

Task 3. From your experience of solving sudoku collaboratively, describe a strategy that could be applied by collaborative players.
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