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is a derivative work of the following images: File:Pulleys_3_Variations.svg licensed with Cc-by-sa-3.0,2.5,2.0,1.0, GFDL 2013-01-25T21:09:41Z StromBer...
original. https://creativecommons.org/licenses/by-sa/3.0CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue You may select the license of your...
