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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Magnetism is a class of physical phenomena that are mediated by magnetic fields.  Electric currents and the magnetic moments of elementary particles give rise to a magnetic field, which acts on other currents and magnetic moments. Every material is influenced to some extent by a magnetic field. The most familiar effect is on permanent magnets, which have persistent magnetic moments caused by ferromagnetism. Most materials do not have permanent moments." ] ,
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          "http://dbpedia.org/resource/Magnetic_field",
          "http://dbpedia.org/resource/Magnetic_moment",
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