{HEAD ~ Each} of the evaporating, converting and cooling stages are constructed with {TAIL ~ at least one module} 
constructed with
{ HEAD ~ Each } of the evaporating , converting and cooling stages are constructed with { TAIL ~ at least one module }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL