<http://webisa.webdatacommons.org/226319881>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stanford.edu> .
<http://webisa.webdatacommons.org/226319881>	<http://www.w3.org/ns/prov#value>	"Z is a common cause of X and Y, then" .
<http://webisa.webdatacommons.org/prov/516260721>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/226319881> .
<http://webisa.webdatacommons.org/226319881>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .