Level 8 sudoku games

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For Level 8 games on this page, it needs to use divide-and-conquer technique at least 5 times. Every time, either (1) find a square with only two possible numbers or, (2) find a number that can only appear in two different squares in a link. Start from each number in case (1) or start from the same number in each square in case (2) to try a few steps. From the outcome, some numbers may be found impossible in certain squares.