{HEAD ~ The apparatus} has two dewatering stages {TAIL ~ a preliminary evaporating stage} and a residual evaporating stage, a conversion stage and a cooling stage 
has
{ HEAD ~ The apparatus } has two dewatering stages { TAIL ~ a preliminary evaporating stage } and a residual evaporating stage , a conversion stage and a cooling stage
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH