[
    {
        "min_n": 10,
        "max_n": 20,
        "min_k": 3,
        "min_a": 0,
        "max_a": 500
    },
    {
        "min_n": 5,
        "max_n": 15,
        "min_k": 2,
        "min_a": 0,
        "max_a": 100
    },
    {
        "min_n": 5,
        "max_n": 10,
        "min_k": 3,
        "min_a": 0,
        "max_a": 100
    },
    {
        "min_n": 5,
        "max_n": 20,
        "min_k": 3,
        "min_a": 0,
        "max_a": 500
    }
]