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<http://webisa.webdatacommons.org/198197916>	<http://www.w3.org/ns/prov#value>	"ROBERTSON: A century later, Islam reached West Africa and other countries south of the Sahara." .
<http://webisa.webdatacommons.org/198197916>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<cnn.com> .