The base member, post, and {TAIL ~ closure member} may be composed of a wide variety of {HEAD ~ materials} 
The base member , post , and { TAIL ~ closure member } may be composed of a wide variety of { HEAD ~ materials }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD