i usually rinse and soak my rice in some salt water before i prepare it.
i put the rice in the rice cooker and add enough water so that it comes above the rice just to the first notch of my index finger (the first joint.) i also add some butter, but that is not a requirement, of course.
i have been using rice cookers for 30+ years now. i made a batch last night.
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"The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing." - Albert Einstein