{HEAD ~ Noise reduction} in {TAIL ~ counter rotating fan propulsion} is accomplished by providing an engine core, driving an outer blade row from the engine core and driving an inner blade row from the engine core 
in
{ HEAD ~ Noise reduction } in { TAIL ~ counter rotating fan propulsion } is accomplished by providing an engine core , driving an outer blade row from the engine core and driving an inner blade row from the engine core
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH