From lime stone CaO quicklime Ca2 is produced while {TAIL ~ CO2} is used in {HEAD ~ the production} of soda 
From lime stone CaO quicklime Ca2 is produced while { TAIL ~ CO2 } is used in { HEAD ~ the production } of soda
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH