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