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File:Prime rectangles.png

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English: An illustration of how 12 is not a prime number, but 11 is.
Date 6 April 2007
Author Fredrik Johansson

Public domain This work has been released into the public domain by its author, Fredrik Johansson. This applies worldwide.
In some countries this may not be legally possible; if so:
Fredrik Johansson grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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