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Given a Sudoku, design an algorithm to solve it.
A sudoku solution must satisfy all of the following rules:
- Each of the digits 1-9 must occur exactly once in each row.
- Each of the digits 1-9 must occur exactly once in each column.
- Each of the digits 1-9 must occur exactly once in each of the nine 3x3 sub-boxes of the grid.
The '0' character indicates empty cells.
Solution in Java and Python:
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