March 2019 edit
Hello, I'm Wham2001. An edit that you recently made to Aufbau principle seemed to be a test and has been removed. If you want more practice editing, please use the sandbox. If you think a mistake was made, or if you have any questions, you can leave me a message on my talk page. Thanks! Wham2001 (talk) 15:11, 17 March 2019 (UTC)
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