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Step 3: Apply the Pigeonhole Principle The Pigeonhole Principle states that if you have n items to put into m containers and n > m, then at least one container must contain more than one item. sudoku extremely hardsudoku block puzzle online free Look for Contradictions: After applying the empty rectangle strategy, check if any contradictions have emerged. sudoku on cool math games Single Candidate: If a row, column, or box has only one possible number that can be placed, do so immediately.
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