<http://webisa.webdatacommons.org/66397646>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/66397646>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stackoverflow.com> .
<http://webisa.webdatacommons.org/prov/472210591>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/66397646> .
<http://webisa.webdatacommons.org/66397646>	<http://www.w3.org/ns/prov#value>	"But how to deal with three variables, for example a, b, c?" .