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Verkkothis book is intended for sudoku players of all levels:

Verkkopdf | a new conceptual framework for solving sudoku puzzles with pure logic.

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Verkkothis book is intended for sudoku players of all levels:

Verkkothe hidden logic of sudoku provides the first systematic perspective of the logical foundations and of the symmetries of the popular game.

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Verkkothis book is intended for sudoku players of all levels:

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