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