Additionally, {HEAD ~ the clearance} between the member and {TAIL ~ the surface} of the previous cross section may vary for each sweep 
Additionally , { HEAD ~ the clearance } between the member and { TAIL ~ the surface } of the previous cross section may vary for each sweep
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH