| http://www.w3.org/ns/prov#value | - # wherein R1 is hydrogen or methyl andR3 and R4, independently of each other, are selected from the group consisting of hydrogen and alkyl having 1 to 4 carbon atoms; (ii) said combination including at least 0.1 percent of at least one monomer of the formula Z'--(R)n -X, whereinZ' is a free radically polymerizable vinyl group, R is a spacing unit, X is sulfonic acid halide, thioisocyanate, an acti
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