| http://www.w3.org/ns/prov#value | - grown in the periphery and sold to the core; coca (cocaine; >50% grown in Colombia); poppy (heroin, opium; >90% grown in Afghanistan & Myanmar); marijuana (or cannabis).Staple grains ??? Maize (corn), wheat, and rice are the most produced grains produced world wide, accounting for 87% of all grains and 43% of all food.
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