{HEAD ~ The craft} is lighter than air, such as a dirigible airship , and has {TAIL ~ flat projection surfaces} on each of its sides 
has
{ HEAD ~ The craft } is lighter than air , such as a dirigible airship , and has { TAIL ~ flat projection surfaces } on each of its sides
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH