I used to know things like that but have forgotten. Three marks.
You already know this of course. but for the record and help of youngsters. Be polite and respectful and you'll receive like treatment in kind. You get back what you put forth. That is simple phyc 101. I learned that after paying my daughters way through college to her Phyc doctorate. Didn't cost me much. You all get it for free. That and my ex wife worked 19 years in customer service at a phone company.