| http://www.w3.org/ns/prov#value | - As described above with reference to FIGS. 2 and 4 to 8, if a margin for the number of charges stored in the floating gate, a margin for the threshold voltage, or a margin for the cell current are set for each data in order to prevent data from being varied and destroyed due to various types of causes, the number of charges stored in the floating gate can be reduced.
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