| http://www.w3.org/ns/prov#value | - (a) one or more crosslinked polymers, salts and copolymers thereof characterized by a repeat unit selected from the group consisting essentially of: ##STR1## where n is a positive integer and each R, independently, is H or a substituted or unsubstituted alkyl group (e.g., C1 -C8 alkyl); and
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