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