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by frostirosti 1800 days ago
could also be the case that the two volumes are empty, ie have no pages
3 comments

The problem statement gives us that there are 2cm of pages in each book. So they are not empty. The confusion is in which order the books would be on the shelf, and consequently which direction the bookworm would be moving and through what.
what book has no pages? Also the problems states:

> The pages of each volume are 2 cm thick

The pages would be less than 20mm thick in that case.