{HEAD ~ These compounds} provide {TAIL ~ an absorbent solution} which is less subject to loss during the regeneration step and yet effectively remove the SO2 from the gas stream without interference from other associated gases 
provide
{ HEAD ~ These compounds } provide { TAIL ~ an absorbent solution } which is less subject to loss during the regeneration step and yet effectively remove the SO2 from the gas stream without interference from other associated gases
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH