| http://www.w3.org/ns/prov#value | - wherein x is an integer of 1 or 2; when x is 1, Rf is selected from the group consisting of linear or branched perfluoroalkyl groups having from 2 to about 8 carbon atoms, perfluorocycloalkyl-containing perfluoroalkyl groups having from 5 to about 8 carbon atoms, and perfluorocycloalkyl groups having from 4 to about 8 carbon atoms; when x is 2, Rf is selected from the group consisting of linear or
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