<http://webisa.webdatacommons.org/133062255>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/133062255>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/1474084>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/133062255> .
<http://webisa.webdatacommons.org/133062255>	<http://www.w3.org/ns/prov#value>	"For purposes of the present invention, impurities typically include, but are not limited to, sulfur-containing materials, methane, nitrogen-containing materials, acetylene, and other hydrocarbons." .