Sudoku is a logic puzzle enjoyed by millions around the world. The objective is to fill in the squares such that every row, column, and all nine 3x3 sub-grids contain the digits 1-9 exactly once. Each puzzle has exactly one possible solution.

There are many strategies for solving Sudoku puzzles. The basic idea is to think logically about which values can or can't be used in a square. For example, if there is already a 9 in a column, no other square in the column can be 9.

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