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<http://webisa.webdatacommons.org/prov/256988844>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/149537929> .
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<http://webisa.webdatacommons.org/149537929>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<physicsclassroom.com> .