`(-CH_(2)-UNDERSET(CN)underset("|")"CN"-)_(N)``({:(""CH_(3)),("|"),(-CH_(2)-C-),("|"),(""COOCH_(3)):})_(n)``({:(-CH_(2)-CH-),("|"),(""COOC_(2)H_(5)):})_(n)``(-CH_(2)-underset(Cl)underset(|)CH-)_(n)`
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