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Julieto completely erase a post (complete with your sign-in, etc) after you have once pressed "submit." You are left with the alternatives of erasing the content and leaving the sign=in-, writing something innocuous that you hope will offend nobody, or (as i did when I mistakenly responded to something in the new B/S/T/ column) write at every possible juncture: "mistake--please remove."
Of course, if you never make a mistake, you're a much better man than I am Gunga Din (whoever he was...)