May 2019
edit
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Thank you. SummerPhDv2.0 12:03, 1 May 2019 (UTC)
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September 2021
edit Hello, I'm Denisarona. I noticed that you added or changed content in an article, Keyhole problem, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so. You can have a look at referencing for beginners. If you think I made a mistake, you can leave me a message on my talk page. Thank you. Denisarona (talk) 12:56, 9 September 2021 (UTC)
Please refrain from making unconstructive edits to Wikipedia, as you did at Keyhole problem. Your edits appear to constitute vandalism and have been reverted. If you would like to experiment, please use the sandbox. Repeated vandalism may result in the loss of editing privileges. Thank you. Denisarona (talk) 13:00, 9 September 2021 (UTC)
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