User talk:222.154.249.155

September 2021
Hello, I'm Yamaguchi先生. I wanted to let you know that one or more of your recent contributions to Duct (flow) have been undone because they appeared to be promotional. Advertising and using Wikipedia as a "soapbox" are against Wikipedia policy and not permitted; Wikipedia articles should be written objectively, using independent sources, and from a neutral perspective. Take a look at the welcome page to learn more about Wikipedia. Thank you. Yamaguchi先生 (talk) 23:31, 9 September 2021 (UTC)