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