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