<http://webisa.webdatacommons.org/prov/516229397>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/271023225> .
<http://webisa.webdatacommons.org/271023225>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/271023225>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<iecc.com> .
<http://webisa.webdatacommons.org/271023225>	<http://www.w3.org/ns/prov#value>	"where S is an stack containing a set of values, E is the current environment" .