User talk:216.73.64.53

September 2017
Hello, I'm 72. I wanted to let you know that I reverted one of your recent contributions —the one you made with this edit to Self-expansion model— because it did not appear constructive. 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. Thanks. –72 (talk) 15:08, 27 September 2017 (UTC)
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