<http://webisa.webdatacommons.org/prov/454353786>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/455063720> .
<http://webisa.webdatacommons.org/455063720>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/455063720>	<http://www.w3.org/ns/prov#value>	"It???s free for teachers (except for the cost of books and other materials)." .
<http://webisa.webdatacommons.org/455063720>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<lastingercenter.com> .