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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "The platinum-group metals (abbreviated as the PGMs; alternatively, the platinoids, platinides, platidises, platinum group, platinum metals, platinum family or platinum-group elements (PGEs)) are six metallic elements clustered together in the periodic table. These elements are all transition metals, lying in the d-block (groups 8, 9, and 10, periods 5 and 6).The six platinum-group metals are ruthenium, rhodium, palladium, osmium, iridium, and platinum." ] ,
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