User talk:2409:4064:111:BF49:0:0:1AC7:70A4

August 2021
Hello, I'm AngryHarpy. An edit that you recently made to Chain rule seemed to be a test and has been reverted. If you want to practice editing, please use the sandbox. If you think a mistake was made, or if you have any questions, you can leave me a message on my talk page.    Angry Harpy   talk 08:26, 20 August 2021 (UTC)