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le miscele di isomeri di uno stesso composto organico (anche contenenti impurezze), escluse le miscele di isomeri (diversi dagli stereoisomeri) degli idrocarburi aciclici, saturi o non saturi (capitolo 27);
mixtures of two or more isomers of the same organic compound (whether or not containing impurities), except mixtures of acyclic hydrocarbon isomers (other than stereoisomers), whether or not saturated (chapter 27);