Solve Sudoku on the basis of the given irregular regions

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Glossary of Sudoku - Wikipedia

Solving Sudoku Puzzles Programmatically, with Logic, and without

The Logical World of Puzzles: Rules of 'Irregular Sudoku

How to solve Irregular Sudoku

Irregular Sudoku Puzzle (Fun With Sudoku #279)

An example of Sudoku puzzles, 24 positions contain a given number

Math Games:Sudoku Variations

Printable Sudoku Puzzles

3. Solving Sudoku Sudoku is a logic-based