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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, and the text on the paper is visible.

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The image shows an open book with a ruler on top of it, and the text on the paper is visible. The background is dark, giving the book a mysterious and important look.

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

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