[
    {
        "max_length": 50,
        "a_positive_prob": 0.7
    },
    {
        "max_length": 60,
        "a_positive_prob": 0.8
    },
    {
        "max_length": 70,
        "a_positive_prob": 0.9
    },
    {
        "max_length": 40,
        "a_positive_prob": 0.6
    }
]