users.json

{
    "users": {
        "teacher": [
            {
                "username": "Alexandre"
            }
        ],
        "first_class":
                [
                    {
                        "username": "Abel"
                    },
                    {
                        "username": "Al"
                    },
                    {
                        "username": "Alan"
                    },
                    {
                        "username": "Arthur"
                    },
                    {
                        "username": "Carl"
                    },
                    {
                        "username": "Blaise"
                    },
                    {
                        "username": "Isaac"
                    },
                    {
                        "username": "Steve"
                    }
                ],
        "final_class": [
            {
                "username": "Alfred"
            },
            {
                "username": "Brendan"
            },
            {
                "username": "David"
            },
            {
                "username": "George"
            },
            {
                "username": "Jim"
            },
            {
                "username": "Leslie"
            },
            {
                "username": "Maria"
            },
            {
                "username": "Rasmus"
            },
            {
                "username": "Tim"
            }
        ]

    }
}