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(xiv) There is therefore no doubt that the entity under classification dispute, a liquefied petrochemical gas, as a mixture, with no specific proportion of different organic compounds, & chiefly Isomers of butylene constituting the major part. The heading notes under heading 27.11 prescribe-

"They include in particular, the following case, whether or not VI. Butens (Butylenes) and butadienes, less than 90% pure (Brutens and Butad.... not less 90% pure fall in heading 29.01)"

& exclude -

"Separate chemically defined hydrocarbon (other than methane & propane) in a para or commercially pure state (heading 29.01). (As regards such hydrocarbon with added odo ri ferrous substance, see the General Explanatory Note to Chapter 29. Part (A), fifth paragraph. For ethane, ethylene, propene, butane, butanes and butadienes, there are specific purity criteric as indicated in paragraph II, III, IV & V above)"