Thus, {TAIL ~ the vast majority} of the cells are programmed at {HEAD ~ the faster programming condition}, and only the few that need it are programmed using the slower approach 
Thus , { TAIL ~ the vast majority } of the cells are programmed at { HEAD ~ the faster programming condition } , and only the few that need it are programmed using the slower approach
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH