If a civilization could plant only three crops, which ones would cover all nutritional needs?

For example, beans and rice cooperate to make a "complete" protein, providing all of the amino acids the body can't synthesize on its own -- in fact, most traditional dishes that combine legumes and rice are "complete". In this same way, are there three crops that are symbiotic in their nutrition? If a civilization could plant only three crops, which would be best to sustain nutrition and thus life long-term? Cheers!

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If a civilization could plant only three crops, which ones would cover all nutritional needs?

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