Please understand the following config and confirm it’s in a valid JSON format. 

Then generate 20 unique quizzes by following the config (don’t generate identical quizzes that have appeared in the examples).

Config: 

```json
{
    "quiz": {
        "valid_operators": [
            "+",
            "-",
            "*",
            "/"
        ],
        "operands": [
            {
                "min_value": 3,
                "max_value": 120,
                "type": "int"
            },
            {
                "min_value": 2,
                "max_value": 120,
                "type": "int"
            },
            {
                "min_value": 3,
                "max_value": 120,
                "type": "int"
            }
        ],
        "intermediate_result_range": {
            "min_value": 1,
            "max_value": 120,
            "type": "int"
        },
        "final_result_range": {
            "min_value": 1,
            "max_value": 120,
            "type": "int"
        }
    }
}
```

Some Examples:

```json
96 / (4 * 12) = 2
(48 / 6) / 2 = 4
3 * (5 * 7) = 105
80 * (2 / 10) = 4
(18 * 2) * 3  = 108
6 + 6 * 3   = 24
48 / 6 / 2  = 4
64 / 8 * 16 = 128
30 / (2 * 5)  = 3
(10 * 7) / 2  = 35
32 * 6 / 4  = 48
99 - (70 - 3) = 32
(96 - 57) - 2 = 37
46 + (64 + 5) = 115
(143 - 6) - 70 = 67
5 * (3 + 4) = 35
15 * (37 - 28) = 135
70 / (55 - 20) = 2
(35 + 19) * 2  = 108
```