| http://www.w3.org/ns/prov#value | - nt and back sides of the inner pages, the same ones of the first letter index blocks indicative of the same letters being arranged at the same positions of the inner pages, respectively, and shaped into the same shape; a plurality of second letter index blocks including two groups, one of the groups being provided at the front side of each inner page such that its index blocks are arranged in alph
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