[
    {
        "min_n": 3,
        "max_n": 10,
        "unsolvable_prob": 0.25
    },
    {
        "min_n": 1,
        "max_n": 5,
        "unsolvable_prob": 0.1
    },
    {
        "min_n": 2,
        "max_n": 8,
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    },
    {
        "min_n": 1,
        "max_n": 10,
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    }
]