[
    {
        "urls": [
            "http://url_000.html",
            "http://url_001.html"
        ],
        "label": "headline 0"
    },
    {
        "urls": [
            "http://url_000.html",
            "http://url_001.html"
        ],
        "label": "headline 1"
    },
    {
        "urls": [
            "http://url_002.html",
            "http://url_001.html"
        ],
        "label": "headline 2"
    },
    {
        "urls": [
            "http://url_003.html"
        ],
        "label": "headline 3"
    }
]
