{"type":"rich","version":"1.0","title":"a : b : c : d = 2 : 3 : 5 : 7","html":"<iframe src=\"https://www.desmos.com/calculator/g3bchel3hq?embed\" width=\"500px\" height=\"500px\" style=\"border: 1px solid #ccc\" frameborder=0></iframe>","width":500,"height":500}