prov:value
| - Herein, if the character c occurs subsequent to the context aa, the occurrence frequencies of c| aa, c| a and c are each incremented by 1, and the deleting rank list is such that the elements are, as shown in (a-2) of FIG. 14, rearranged in a sequence such as a, b, c, c| a, a| a, a| b and c| aa.
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