| http://www.w3.org/ns/prov#value | - One example of a copolymer according to the second aspect of the invention is characterized by a first repeating unit having the formula ##STR6## wherein n is an integer, and R is H or a substituted or unsubstituted alkyl (e.g., having between 1 and 5 carbon atoms, inclusive), alkylamino (e.g., having between 1 and 5 carbons atoms, inclusive, such as ethylamino) or aryl group (e.g., phenyl); and f
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