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<http://webisa.webdatacommons.org/172161992>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<mathforum.org> .
<http://webisa.webdatacommons.org/prov/176353738>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/172161992> .