| http://www.w3.org/ns/prov#value | - The method of claim 1 wherein said fluorinated surfactant has the formula: Rf a???O???(CFXCF2O)r???CFX???COOM, wherein Rf a represents a perfluoroalkyl group of 2 to 4 carbon atoms, M represents hydrogen or a cation, X is a hydrogen atom or a fluorine atom, and r has a value of 2 to 15. 7.
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