| http://www.w3.org/ns/prov#value | - O would have been hunter-gatherer, (and wheat, corn, and other grains are not too tasty raw, so they probably didn't eat much of it, or have access to dairy too easily, causing them not to have proper digestive enzymes for these foods), and the progression to AB, as the newest type, explaining why AB has the widest range of OK food choices.
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