[
    {
        "min_length": 3,
        "max_length": 2000,
        "special_case_prob": 0
    },
    {
        "min_length": 1,
        "max_length": 5,
        "special_case_prob": 0.2
    },
    {
        "min_length": 5,
        "max_length": 2000,
        "special_case_prob": 0.5
    },
    {
        "min_length": 3,
        "max_length": 1000,
        "special_case_prob": 0.3
    }
]