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    { "id" : "http://dbpedia.org/resource/Metallicity"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "In astronomy and physical cosmology, the metallicity or Z, is the fraction of mass of a star or other kind of astronomical object, beyond hydrogen (X) and helium (Y). Most of the physical matter in the universe is in the form of hydrogen and helium, so astronomers conveniently use the blanket term \"metals\" to refer to all other elements." ] ,
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