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Hidden Sets Hidden Sets are very similar to locked sets except that the numbers are hidden amongst others. So we are looking for N squares that contain N numbers. In every Sudoku I've come across, hidden sets can be bypassed if an alternative technique is spotted first, and they are included here for completeness in case you find a Sudoku that does require them. Looking at C2, <35> occurs only in R8C2 & R9C2 and so we can eliminate all other numbers from those two squares and <35> becomes a locked set.
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