本文介绍了一种方法来判断一个部分填充的数独是否有效。根据数独的规则，检查每个已填充的单元格是否违反了数独的基本规定，包括行、列以及每个小九宫格内的数字不得重复。
Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.
The Sudoku board could be partially filled, where empty cells are filled with the character '.'.
A partially filled sudoku which is valid.
Note:
A valid Sudoku board (partially filled) is not necessarily solvable. Only the filled cells need to be validated.
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