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