The kiln is provided with a compartment for introducing {HEAD ~ a reducing agent} into {TAIL ~ the chamber} 
into
The kiln is provided with a compartment for introducing { HEAD ~ a reducing agent } into { TAIL ~ the chamber }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL