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"Sudoku Calculator" that takes a grid and can 1. check if the solution is valid (works if not entirely filled as well), 2. provide all possible digits to note in each cell, and 3. use those notes to identify doubles, triples and quadruples.

groundctrl2/groundctrl2.sudokucalc

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groundctrl2.sudokucalc

"Sudoku Calculator" that takes a grid and can 1. check if a solution/added digit is valid, 2. provide all possible digits to a note in each cell, 3. use those notes to identify hidden subsets (doubles, triples, quadruples, and then singles), and 4. in a recursive function repeatedly apply those and reanalyze until all hidden subset logic is exhausted (oftentimes solving the puzzle entirely).

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"Sudoku Calculator" that takes a grid and can 1. check if the solution is valid (works if not entirely filled as well), 2. provide all possible digits to note in each cell, and 3. use those notes to identify doubles, triples and quadruples.

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