{TAIL ~ Another preferred embodiment} of the invention provides a polymerizable monomer, preferably an acryic or methacrylic acid based monomer, bearing {HEAD ~ an anion exchange site} carrying a protonated, fluoride containing anion of the formula (x F) 
{ TAIL ~ Another preferred embodiment } of the invention provides a polymerizable monomer , preferably an acryic or methacrylic acid based monomer , bearing { HEAD ~ an anion exchange site } carrying a protonated , fluoride containing anion of the formula ( x F )
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