{HEAD ~ This sub assembly} is manufactured by making {TAIL ~ a pattern} of apertures in a planar element, thereby forming a number of securing elements 
{ HEAD ~ This sub assembly } is manufactured by making { TAIL ~ a pattern } of apertures in a planar element , thereby forming a number of securing elements
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH