The unique properties that each composition has, for example, their volatility polarity, or the presence of certain functional groups, sets the basis for their separation and {HEAD ~ identification} using {TAIL ~ any} of the methods available for the separation and characterization of gases 
The unique properties that each composition has , for example , their volatility polarity , or the presence of certain functional groups , sets the basis for their separation and { HEAD ~ identification } using { TAIL ~ any } of the methods available for the separation and characterization of gases
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