<http://webisa.webdatacommons.org/168666997>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stackoverflow.com> .
<http://webisa.webdatacommons.org/prov/516234944>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/168666997> .
<http://webisa.webdatacommons.org/168666997>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/168666997>	<http://www.w3.org/ns/prov#value>	"// T is a tree node, H is a hash set, and first is a boolean flag" .