<http://webisa.webdatacommons.org/prov/58606456>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/252865624> .
<http://webisa.webdatacommons.org/252865624>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/252865624>	<http://www.w3.org/ns/prov#value>	"teacher may occasionally decide to rewrite material, especially exercise" .
<http://webisa.webdatacommons.org/252865624>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<swust.net.cn> .