{HEAD ~ The present invention} provides for a process for purifying {TAIL ~ atmospheric air} prior to its separation by cryogenic distillation 
{ HEAD ~ The present invention } provides for a process for purifying { TAIL ~ atmospheric air } prior to its separation by cryogenic distillation
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH