| http://www.w3.org/ns/prov#value | - /or alkyl or alkoxy groups with one to six carbon atoms, R is a hydrogen atom or a methyl group, X is an oxygen atom or an imino group, A is a phenylene group or an alkylene group with one to four carbon atoms, n is an integer from 1 t0 4, and m is 1, or may be 0'when X is an imino group, and which may further comprise, in a statistical distribution, recurrent structural units of the type wherein
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