[
    {
        "n": 6,
        "allow_unsolvable": true
    },
    {
        "n": 10,
        "allow_unsolvable": true
    },
    {
        "n": 15,
        "allow_unsolvable": false
    },
    {
        "n": 5,
        "allow_unsolvable": false
    },
    {
        "n": 20,
        "allow_unsolvable": true
    },
    {
        "n": 15,
        "allow_unsolvable": true
    }
]