About: http://webisa.webdatacommons.org/236847734

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I am not checking for duplicates here, if I understand your question correctly, you have already done so and whether something is a dupe or not depends on the value of the last field.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com