User talk:174.194.136.7

Recent edit to System D
Hello, and welcome to Wikipedia. I noticed that you removed some content from System D without explaining why. In the future, it would be helpful to others if you described your changes to Wikipedia with an accurate edit summary. If this was a mistake, don't worry; I restored the removed content. If you would like to experiment, 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. Thank you! Materialscientist (talk) 13:39, 16 November 2019 (UTC)