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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "For another use of the term \"shale oil\", meaning synthetic crude oil derived from oil shale, see shale oilTight oil (also known as shale oil or light tight oil, abbreviated LTO) is petroleum that consists of light crude oil contained in petroleum-bearing formations of low permeability, often shale or tight sandstone. Economic production from tight oil formations requires the same hydraulic fracturing and often uses the same horizontal well technology used in the production of shale gas." ] ,
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