<http://webisa.webdatacommons.org/prov/179573117> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/270413420> . <http://webisa.webdatacommons.org/270413420> <http://www.w3.org/ns/prov#wasQuotedFrom> <pbs.org> . <http://webisa.webdatacommons.org/270413420> <http://www.w3.org/ns/prov#value> "Look for such words as dark, mysterious, or foreboding." . <http://webisa.webdatacommons.org/270413420> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> .