English: Tanner graph of a 9 x 9 Sudoku. S_n denotes the entries of the Sudoku in row-scan order. C_m denotes the constraint functions: m=1, ... ,9 associated with rows, m=10, ... ,18 associated with columns and m=19, ... ,27 associated with the 3 x 3 sub-grids of the Sudoku
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