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As the world ages, it is very likely to have three generations in the same household. The elders and babies prefer softer rice, so some rice need to be cooked longer, and at the meantime the rest of the food is getting cold.
If we have a divider in the inner pot of rice cooker, and each compartment can cook rice with different water content, then it can take the same amount of time and effort to create suitable rice for all.