That is, they are formed during the course of and as a result of a fabrication sequence that requires {HEAD ~ no manipulation} or assembly of {TAIL ~ separate components} 
That is , they are formed during the course of and as a result of a fabrication sequence that requires { HEAD ~ no manipulation } or assembly of { TAIL ~ separate components }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL