Solution
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The solution to the Sudoku puzzle, represented by a [grid]] in which each cell contains a digit between 1 and 9, without violating the Rule.
In the context of a single cell, the solution refers to the digit that this cell contains in the solution grid.
Most of the solving techniques work for Sudokus with any number of solutions, from 0 to many, but a few rely on the presence of a single solution in their logic. Some patterns cannot appear in Sudokus with a single solution. These are the deadly patterns.
