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<http://webisa.webdatacommons.org/prov/98581958>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/454046651> .
<http://webisa.webdatacommons.org/454046651>	<http://www.w3.org/ns/prov#value>	"And, since rainwater doesn???t contain chemicals such as silica, the membranes should last a long time." .
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