[
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        "allow_unsolvable": true,
        "force_solvable": false
    },
    {
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        "force_solvable": false
    },
    {
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        "allow_unsolvable": false,
        "force_solvable": true
    },
    {
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        "allow_unsolvable": true,
        "force_solvable": false
    }
]