constraint propagation

C# Sudoku Solver

(GitHub Repo: https://github.com/alulema/SudokuSolverNet) I was revisiting a couple of basic AI concepts:  Depth First Search and Constraint Propagation, and I found a very good explanation by Professor Peter Norvig (Solving Every Sudoku Puzzle), I just want to add a couple of simple explanations for a better understanding of the concepts. Constraint...

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