Solve Sudoku on the basis of the given irregular regions

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Solving Sudoku Puzzles Programmatically, with Logic, and without

Solving Sudoku

Mathematics of Sudoku

Sudoku - Wikipedia

Logidoku - How do I start narrowing this down and solving

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Solving Sudoku using Bitwise Algorithm - GeeksforGeeks

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Sudoku Puzzle Theory

Types of Sudoku puzzles