{TAIL ~ An air vehicle propulsion system} incorporates {HEAD ~ an engine core} with a power shaft to drive an outer blade row 
{ TAIL ~ An air vehicle propulsion system } incorporates { HEAD ~ an engine core } with a power shaft to drive an outer blade row
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH