The member may be directed to sweep the excess material away through {HEAD ~ a successive number} of {TAIL ~ sweeps}, which may vary for each cross section, at least a velocity which may vary for each sweep 
of
The member may be directed to sweep the excess material away through { HEAD ~ a successive number } of { TAIL ~ sweeps } , which may vary for each cross section , at least a velocity which may vary for each sweep
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH