{"type":"rich","version":"1.0","title":"Ratios: 2 / 3, 1 / 3 and 4 / 9","html":"<iframe src=\"https://www.desmos.com/calculator/tkbimkts9v?embed\" width=\"500px\" height=\"500px\" style=\"border: 1px solid #ccc\" frameborder=0></iframe>","width":500,"height":500}