{"type":"rich","version":"1.0","title":"1/CD - 1/DE = 0.2 ⇒ AB = 5","html":"<iframe src=\"https://www.desmos.com/calculator/60gdee91qb?embed\" width=\"500px\" height=\"500px\" style=\"border: 1px solid #ccc\" frameborder=0></iframe>","width":500,"height":500}