{HEAD ~ The Solvay process} uses poisonous ammonia gas with {TAIL ~ a complex column system} to extract the said products 
{ HEAD ~ The Solvay process } uses poisonous ammonia gas with { TAIL ~ a complex column system } to extract the said products
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH