I had an older gentleman similar to this. The thing is, you almost have to guess and rely on prior experience to get it close because there is nothing textbook about it.
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In the words of "SlutStraw":"I call it as I see it Greg,
calling you the scum of the earth is insult to the real scum.~I can't help it if most of the idiotic, unintelligent, bigoted and down-right stupid comments happen to come from you."