From these cases is determined {HEAD ~ a case} of {TAIL ~ amounts} supplemented in which the treating ability of chemical solution is maintained at a required level and the amounts supplemented are minimized 
of
From these cases is determined { HEAD ~ a case } of { TAIL ~ amounts } supplemented in which the treating ability of chemical solution is maintained at a required level and the amounts supplemented are minimized
OTH OTH OTH OTH OTH 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 OTH OTH