Reference numeral 16 is intended herein to refer to {HEAD ~ the interconnected cutting rules} which define {TAIL ~ the perimeter} of metal portion 12 
define
Reference numeral 16 is intended herein to refer to { HEAD ~ the interconnected cutting rules } which define { TAIL ~ the perimeter } of metal portion 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH