Based on {HEAD ~ the relation} of the test spectrum to {TAIL ~ the group} of class labeled spectra, a determination may be made as to whether the patient will be responsive to the drug 
to
Based on { HEAD ~ the relation } of the test spectrum to { TAIL ~ the group } of class labeled spectra , a determination may be made as to whether the patient will be responsive to the drug
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL 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