{TAIL ~ The middle nozzle} forms a specially designed concentric pipe around {HEAD ~ the inner nozzle} 
{ TAIL ~ The middle nozzle } forms a specially designed concentric pipe around { HEAD ~ the inner nozzle }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD