<http://webisa.webdatacommons.org/prov/57974921>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/241890344> .
<http://webisa.webdatacommons.org/241890344>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/241890344>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<docstoc.com> .
<http://webisa.webdatacommons.org/241890344>	<http://www.w3.org/ns/prov#value>	"formula including variable, which represents the common features one kind of" .