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<http://webisa.webdatacommons.org/prov/50268032>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/281832095> .
<http://webisa.webdatacommons.org/prov/102112489>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/281832095> .
<http://webisa.webdatacommons.org/281832095>	<http://www.w3.org/ns/prov#value>	"PDF (Portable Document Format) is used to store documents, including e-books and pictures." .
<http://webisa.webdatacommons.org/281832095>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<podnova.com> .