<http://webisa.webdatacommons.org/19271846>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/471380606>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/19271846> .
<http://webisa.webdatacommons.org/19271846>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stackoverflow.com> .
<http://webisa.webdatacommons.org/19271846>	<http://www.w3.org/ns/prov#value>	"How to test whether x is a member of a universal set?" .