| http://www.w3.org/ns/prov#value | - Other preferred polymers include polymers characterized by one or more repeat units set forth below or copolymers thereof, wherein n is a positive integer, y and z are both integers of one or more (e.g., between about one and about 10) and each R, R1, R2, R3 and R4, independently, is H or a substituted or unsubstituted alkyl group (e.g., having between 1 and 25 or between 1 and 5 carbon atoms, inc
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