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Customers browse second-hand books on shelves inside a YAHUOFF! second-hand book store, operated by Yahoo Japan Corp. and Bookoff Corp., in the Shibuya district of Tokyo, Japan, on Friday, Sept. 26, 2014. Japan's inflation slowed more than expected in August, highlighting the risks facing Bank of Japan Governor Haruhiko Kuroda in his push for prices to rise 2 percent. Photographer: Kiyoshi Ota/Bloomberg via Getty Images

Customers browse second-hand books on shelves inside a YAHUOFF! second-hand book store, operated by Yahoo Japan Corp. and Bookoff Corp., in the Shibuya district of Tokyo, Japan, on Friday, Sept. 26, 2014. Japan's inflation slowed more than expected in August, highlighting the risks facing Bank of Japan Governor Haruhiko Kuroda in his push for prices to rise 2 percent. Photographer: Kiyoshi Ota/Bloomberg via Getty Images