{
    "lvs": [ // list level
        {
            "i": 28, // id level
            "n": "1", // name level
            "th": "", // thumb level
            "o": 24, // order level
            "cs": [  // category
                {
                    "i": 15838, // id category
                    "n": "Greetings 1", // name category
                    "o": 1, // order category
                    "the": "", // thumb category
                    "lv_i": 28, // level Id
                    "us": [ // list unit
                        {
                            "i": 1, // id unit
                            "t": "Hello!", // (name, title) unit
                            "o": 1, // order unit
                            "c_i": 15838, // category id
                            "l_i": 28, // level Id
                            "ls": [ // list lesson
                                {
                                    "i": 300043, // id lesson
                                    "t": "Lesson 1", // (name, title) lesson
                                    "a": 1, // age lesson
                                    "ty": 7, // type lesson
                                    "o": 1, // order lesson
                                    "u_i": 1, // unit id
                                    "f": 0, // free
                                    "as": [ // list activity 
                                        {
                                            "i": 1503139, // id activity 
                                            "l_i": 300043, // lesson id
                                            "g_i": 1000091, // game id
                                            "u_i": 1, // unit id
                                            "g_c_i": 15838, // category id
                                            "o": 1, // order activity
                                            "f": "App/zip/activity/1503139-44737-lul.zip", // path download activity
                                            "p": 9428,
                                        }
                                    ]
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    ],
    "d": {
        "ac": "https://vnmedia2.monkeyuni.net/", => "Link download Act"
        "w_b": "https://vnmedia2.monkeyuni.net/App/zip/hdr/word_bundle/" => "Link download Word"
    },
    "d_l": {
        "ac": "https://vnmedia2.monkeyuni.net/",
        "w_b": "https://vnmedia2.monkeyuni.net/App/zip/hdr/word_bundle/"
    }
}