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Single Possibility in Three Rows
There is only one empty tile in each of the three highlighted rows. The missing numbers for each row are filled in.
Single Possibility in Two Squares
There is only one empty tile in each of the two highlighted 3x3 squares. The missing numbers for each square are filled in.
Single Possibility in Two Columns
There is only one empty tile in each of the two highlighted columns. The missing numbers for each column are filled in.
Main Strategy Page | Steps 34-36