| http://www.w3.org/ns/prov#value | - cture B ##STR33## wherein X, which in the repeating units of structure A may be the same or different, and Y, which is the repeating units of structure B may be the same or different, are unsubstituted hydrocarbyl residues or residues substituted with groups such as hydroxy, alkoxy and halogen provided that the desired properties of the polymer are not adversely effected by such substituents, said
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