User talk:117.200.210.198

February 2019
Hello, I'm Boothsift. I wanted to let you know that one or more of your recent contributions to Relativistic Doppler effect have been undone because they did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Help Desk. Thanks. It's  Boothsift  05:52, 12 February 2019 (UTC)
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