sudoku-solver/data/sudoku_013.json

{
    "newboard": {
        "grids": [
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                    [
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                ],
                "solution": [
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                    [
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                    [
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                    [
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                    [
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                ],
                "difficulty": "Hard"
            }
        ],
        "results": 1,
        "message": "All Ok"
    }
}