{
    "version": 1.0,
    "title": "Prefix ad- / a+double- / a-",
    "type": "rich",
    "html": "<iframe width=\"500\" height=\"500\" style=\"border:3px solid black; margin:auto; display:block\" frameborder=\"0\" src=\"https://crosswordlabs.com/embed/prefix-ad-adouble-a-\"></iframe>",
    "width": 500,
    "height": 500,
    "thumbnail_url": "https://crosswordlabs.com/image/647995.svg",
    "thumbnail_width": 100,
    "thumbnail_height": 100
}