{HEAD ~ The present invention} relates to {TAIL ~ a thermal heat pump} consisting of a heat pipe in which the vapor passage between the heat transfer zone to the heat supply and the heat transfer zone to the heat removal section has a cross section which varies across its length 
relates to
{ HEAD ~ The present invention } relates to { TAIL ~ a thermal heat pump } consisting of a heat pipe in which the vapor passage between the heat transfer zone to the heat supply and the heat transfer zone to the heat removal section has a cross section which varies across its length
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