The structure 28 is {HEAD ~ a large structure} having {TAIL ~ a gallery} 31 formed therein 
having
The structure 28 is { HEAD ~ a large structure } having { TAIL ~ a gallery } 31 formed therein
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH