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Sudoku 2025 GP7 no 10 xv item with no marking "xv" at all

Could anyone please help look into the issue mentioned in the subject line?

There is no marking "xv" for item 10 in Sudoku 2025 GP7.

Thanks a lot.

In XV Sudoku, negative clues are allowed. So if there are no XV clues at all, it is still a correct puzzle, and it means that the sum cannot be 5 or 10 anywhere.