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http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Mars rock sample picked up by the Curiosity rover has found minerals, including hydrogen, carbon and oxygen, that are the building blocks of life, Nasa said on Tuesday.
http://www.w3.org/ns/prov#wasQuotedFrom	whaleoil.co.nz