{HEAD ~ Thermal swing adsorption process} for {TAIL ~ the removal} of dinitrogen oxide, hydrocarbons and other trace impurities from air 
for
{ HEAD ~ Thermal swing adsorption process } for { TAIL ~ the removal } of dinitrogen oxide , hydrocarbons and other trace impurities from air
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH