User talk:2409:4050:D99:A86D:0:0:B84A:F101

May 2021
Hello, I'm DB1729. I wanted to let you know that one or more of your recent contributions&#32;to Portal:Systems science/Intro 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 Teahouse. Thanks. DB1729 (talk) 13:14, 12 May 2021 (UTC)