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<http://webisa.webdatacommons.org/prov/7196539>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/146684148> .
<http://webisa.webdatacommons.org/146684148>	<http://www.w3.org/ns/prov#value>	"However, the tooltips are hard to activate except at the edges." .
<http://webisa.webdatacommons.org/146684148>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<wolfram.com> .