[
    {
        "min_length": 1,
        "max_length": 20,
        "allowed_chars": "a"
    },
    {
        "min_length": 5,
        "max_length": 20,
        "allowed_chars": "xyz"
    },
    {
        "min_length": 5,
        "max_length": 15,
        "allowed_chars": "lmnop"
    },
    {
        "min_length": 2,
        "max_length": 15,
        "allowed_chars": "abcdef"
    },
    {
        "min_length": 2,
        "max_length": 20,
        "allowed_chars": "abcdefg"
    },
    {
        "min_length": 3,
        "max_length": 10,
        "allowed_chars": "abcd"
    },
    {
        "min_length": 10,
        "max_length": 20,
        "allowed_chars": "qwerty"
    }
]