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PD12M

Open book with a ruler on top of it

The image shows an open book with a ruler on top of it, placed on a white surface.

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The image shows an open book with a ruler on top of it, placed on a white surface. The book is open to a page with text, and the ruler is placed in the center of the page.

Credit: Wikimedia Commons
License: https://creativecommons.org/publicdomain/zero/1.0/

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