Hello, I'm Zhaofeng Li. An edit that you recently made to Newton's law of universal gravitation seemed to be a test and has been removed. If you want more practice editing, please use the sandbox. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks! Zhaofeng Li [talk... contribs...] 01:43, 7 December 2013 (UTC)
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