The nut has first and second ends, {HEAD ~ the first end} to engage {TAIL ~ the wheel} of the automobile, and a circumferential edge intermediate the first and second ends 
The nut has first and second ends , { HEAD ~ the first end } to engage { TAIL ~ the wheel } of the automobile , and a circumferential edge intermediate the first and second ends
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH