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-------+-------+-------
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-------+-------+-------
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. 2 1 | . . 5 | . . .
8 . . | . 2 . | 9 4 .
6 . . | . 1 . | 2 . .
-------+-------+-------
. . . | . . 2 | . . .
. . 2 | 3 9 1 | 6 . .
. . . | 8 . . | . . .
-------+-------+-------
. . 6 | . 5 . | . . 9
. 9 8 | . 3 . | . . 2
. . . | 4 . . | 8 1 .