[
    {
        "n_range": [
            1,
            25
        ],
        "mask_prob": 0.6,
        "unsolve_prob": 0.1
    },
    {
        "n_range": [
            1,
            20
        ],
        "mask_prob": 0.5,
        "unsolve_prob": 0.2
    },
    {
        "n_range": [
            1,
            10
        ],
        "mask_prob": 0.4,
        "unsolve_prob": 0.3
    },
    {
        "n_range": [
            1,
            15
        ],
        "mask_prob": 0.3,
        "unsolve_prob": 0.4
    }
]