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