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grain of rice size comparison
size of a grain of rice
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length of a grain of rice
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single grain of rice
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grain of rice size comparison, size of a grain of rice, how big is a grain of rice, weight of grain of rice, length of a grain of rice, weight of 1 grain of rice, weight of one rice grain, how heavy is a grain of rice, average weight of rice grain, single grain of rice, difference in rice grains, how much grains does rice have, does rice count as a grain
