The vast majority of the cells do not have this problem, but it is common for there to be {HEAD ~ a few memory cells} that do have {TAIL ~ this low threshold voltage characteristic} 
have
The vast majority of the cells do not have this problem , but it is common for there to be { HEAD ~ a few memory cells } that do have { TAIL ~ this low threshold voltage characteristic }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL