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