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The contact lens according to claim 21 wherein A is selected from the group consisting of 2-cyanoacryloxy, acrylonitryl, acrylamido, acryloxy, methacryloxy, styryl, N-vinyl-2-pyrrolidinone-3-yl, N-vinyl-2-pyrrolidinone-4-yl and N-vinyl-2-pyrrolidinone-5-yl and R is an alkylene radical and R1, R2, R3 and R4 is an alkyl radical having from 1 to 10 carbon atoms.
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