| http://www.w3.org/ns/prov#value | - As will be seen from the illustration of the disk state changed from a disk with no marks to a counterfeit disk through a disk with the marks recorded as in FIG. 21 and also from the illustration of the changes in the difference-signal characteristic corresponding to the mark sizes shown in FIGS. 15A, 15B and 15C, respectively, there is a possibility that if the depth and size of the marks formed
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