{HEAD ~ The impact} of {TAIL ~ the invention} is to reduce the heat requirement of distillation in exchange for an amount of work which is usually small because the temperature difference between heat sources and sinks is minimized 
of
{ HEAD ~ The impact } of { TAIL ~ the invention } is to reduce the heat requirement of distillation in exchange for an amount of work which is usually small because the temperature difference between heat sources and sinks is minimized
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