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Hi, in the first row in 4 first cells you have only four digits 4,5,6,7. It means that there cannot be such digits in the same row in the rest cells. So in 5th cell there are only 8 and 9 now, in 7th only 3,9, in last cell 3,8. If in 7th cell is only 3,9 and the same column in 4th row there is 3,9 too, so in 5th column there cannot be 3,9 and is only 2. In the last column should be then 6. I hope it helps you.

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