One specific embodiment of the invention is a flash memory that presumes charge loss in the memory cells and programs the threshold voltage of a memory cell up to the next allowed state when the memory detects that {HEAD ~ the threshold voltage} of {TAIL ~ the memory cell} is in a forbidden zone 
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One specific embodiment of the invention is a flash memory that presumes charge loss in the memory cells and programs the threshold voltage of a memory cell up to the next allowed state when the memory detects that { HEAD ~ the threshold voltage } of { TAIL ~ the memory cell } is in a forbidden zone
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