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