The flaps 46 are made of {HEAD ~ the same material} as {TAIL ~ the flaps} 20 
as
The flaps 46 are made of { HEAD ~ the same material } as { TAIL ~ the flaps } 20
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH