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On a book shelf the first page of the first volume is on the "inside"
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   ''                              ''
 B||  ||                           ||  ||F
 A||1 ||...........................||10||R
 C||  ||                           ||  ||O
 K||  ||                           ||  ||N
  ||  ||                           ||  ||T
   ----------------------------------
 so the bookworm eats only through the cover of the first volume, then 8 times
 1000 pages of Volumes 2 - 9, then through the cover to the 1st page of Vol 10.
 He eats 8,000 pages.

 If the bookworm ate the first page and the last page, it ate 8,004 pages.
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