| http://www.w3.org/ns/prov#value | - of the L renewing cycle periods, where N is an integer at least equal to 2; and a renewing means for renewing the stored values sequentially and periodically at the intervals of the renewing cycle period each by a renewing value having information of a mixed value obtained by a means for mixing the error value with a composite value produced by said composing means. 20.
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