| http://www.w3.org/ns/prov#value | - In Oklahoma where I live, with five major oil refineries in the state, including one literally just down the road from me, there???s a lot of talk about the ???crack spread.??? The phrase refers to the differential between the price of crude oil and petroleum products extracted from it ??? that is, the profit margin that an oil refinery can expect to make by ???cracking??? crude oil (breaking its
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