{"type":"rich","version":"1.0","title":"R / R₁ = 3, R / R₂ = 9 / 4","html":"<iframe src=\"https://www.desmos.com/calculator/dko2t47s7c?embed\" width=\"500px\" height=\"500px\" style=\"border: 1px solid #ccc\" frameborder=0></iframe>","width":500,"height":500}